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go.mod: add go.mod and move pygments to third_party

Browse Source 
After go1.16, go will use module mode by default,
even when the repository is checked out under GOPATH
or in a one-off directory. Add go.mod, go.sum to keep
this repo buildable without opting out of the module
mode.

> go mod init github.com/mmcgrana/gobyexample
> go mod tidy
> go mod vendor

In module mode, the 'vendor' directory is special
and its contents will be actively maintained by the
go command. pygments aren't the dependency the go will
know about, so it will delete the contents from vendor
directory. Move it to `third_party` directory now.

And, vendor the blackfriday package.

Note: the tutorial contents are not affected by the
change in go1.16 because all the examples in this
tutorial ask users to run the go command with the
explicit list of files to be compiled (e.g.
`go run hello-world.go` or `go build command-line-arguments.go`).
When the source list is provided, the go command does
not have to compute the build list and whether it's
running in GOPATH mode or module mode becomes irrelevant.
This commit is contained in:
Hana 2021-02-15 16:22:08 -05:00
parent f72f11e641
commit 9e216da9ef
793 changed files with 5828 additions and 75 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
README.md
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@ -10,7 +10,7 @@ comments from source files in `examples` and rendering
them via the `templates` into a static `public`
directory. The programs implementing this build process
are in `tools`, along with some vendor'd dependencies
in `vendor`.
in `vendor` and `third_party`.
The built `public` directory can be served by any
static content system. The production site uses S3 and

5
go.mod Normal file
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@ -0,0 +1,5 @@
module github.com/mmcgrana/gobyexample
go 1.15
require github.com/russross/blackfriday v1.6.0

2
go.sum Normal file
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@ -0,0 +1,2 @@
github.com/russross/blackfriday v1.6.0 h1:KqfZb0pUVN2lYqZUYRddxF4OR8ZMURnJIG5Y3VRLtww=
github.com/russross/blackfriday v1.6.0/go.mod h1:ti0ldHuxg49ri4ksnFxlkCfN+hvslNlmVHqNRXXJNAY=

2
public/arrays generated
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@ -206,7 +206,7 @@ typical Go. We&rsquo;ll look at slices next.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' var a [5]int\u000A fmt.Println(\"emp:\", a)\u000A');codeLines.push(' a[4] \x3D 100\u000A fmt.Println(\"set:\", a)\u000A fmt.Println(\"get:\", a[4])\u000A');codeLines.push(' fmt.Println(\"len:\", len(a))\u000A');codeLines.push(' b :\x3D [5]int{1, 2, 3, 4, 5}\u000A fmt.Println(\"dcl:\", b)\u000A');codeLines.push(' var twoD [2][3]int\u000A for i :\x3D 0; i \x3C 2; i++ {\u000A for j :\x3D 0; j \x3C 3; j++ {\u000A twoD[i][j] \x3D i + j\u000A }\u000A }\u000A fmt.Println(\"2d: \", twoD)\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' var a [5]int\u000A fmt.Println(\"emp:\", a)\u000A');codeLines.push(' a[4] \u003D 100\u000A fmt.Println(\"set:\", a)\u000A fmt.Println(\"get:\", a[4])\u000A');codeLines.push(' fmt.Println(\"len:\", len(a))\u000A');codeLines.push(' b :\u003D [5]int{1, 2, 3, 4, 5}\u000A fmt.Println(\"dcl:\", b)\u000A');codeLines.push(' var twoD [2][3]int\u000A for i :\u003D 0; i \u003C 2; i++ {\u000A for j :\u003D 0; j \u003C 3; j++ {\u000A twoD[i][j] \u003D i + j\u000A }\u000A }\u000A fmt.Println(\"2d: \", twoD)\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/atomic-counters generated
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@ -236,7 +236,7 @@ state.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"sync\"\u000A \"sync/atomic\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' var ops uint64\u000A');codeLines.push(' var wg sync.WaitGroup\u000A');codeLines.push(' for i :\x3D 0; i \x3C 50; i++ {\u000A wg.Add(1)\u000A');codeLines.push(' go func() {\u000A for c :\x3D 0; c \x3C 1000; c++ {\u000A');codeLines.push(' atomic.AddUint64(\x26ops, 1)\u000A }\u000A wg.Done()\u000A }()\u000A }\u000A');codeLines.push(' wg.Wait()\u000A');codeLines.push(' fmt.Println(\"ops:\", ops)\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"sync\"\u000A \"sync/atomic\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' var ops uint64\u000A');codeLines.push(' var wg sync.WaitGroup\u000A');codeLines.push(' for i :\u003D 0; i \u003C 50; i++ {\u000A wg.Add(1)\u000A');codeLines.push(' go func() {\u000A for c :\u003D 0; c \u003C 1000; c++ {\u000A');codeLines.push(' atomic.AddUint64(\u0026ops, 1)\u000A }\u000A wg.Done()\u000A }()\u000A }\u000A');codeLines.push(' wg.Wait()\u000A');codeLines.push(' fmt.Println(\"ops:\", ops)\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/base64-encoding generated
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@ -191,7 +191,7 @@ but they both decode to the original string as desired.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A b64 \"encoding/base64\"\u000A \"fmt\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' data :\x3D \"abc123!?$*\x26()\'-\x3D@~\"\u000A');codeLines.push(' sEnc :\x3D b64.StdEncoding.EncodeToString([]byte(data))\u000A fmt.Println(sEnc)\u000A');codeLines.push(' sDec, _ :\x3D b64.StdEncoding.DecodeString(sEnc)\u000A fmt.Println(string(sDec))\u000A fmt.Println()\u000A');codeLines.push(' uEnc :\x3D b64.URLEncoding.EncodeToString([]byte(data))\u000A fmt.Println(uEnc)\u000A uDec, _ :\x3D b64.URLEncoding.DecodeString(uEnc)\u000A fmt.Println(string(uDec))\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A b64 \"encoding/base64\"\u000A \"fmt\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' data :\u003D \"abc123!?$*\u0026()\'-\u003D@~\"\u000A');codeLines.push(' sEnc :\u003D b64.StdEncoding.EncodeToString([]byte(data))\u000A fmt.Println(sEnc)\u000A');codeLines.push(' sDec, _ :\u003D b64.StdEncoding.DecodeString(sEnc)\u000A fmt.Println(string(sDec))\u000A fmt.Println()\u000A');codeLines.push(' uEnc :\u003D b64.URLEncoding.EncodeToString([]byte(data))\u000A fmt.Println(uEnc)\u000A uDec, _ :\u003D b64.URLEncoding.DecodeString(uEnc)\u000A fmt.Println(string(uDec))\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/channel-buffering generated
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@ -153,7 +153,7 @@ concurrent receive.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' messages :\x3D make(chan string, 2)\u000A');codeLines.push(' messages \x3C- \"buffered\"\u000A messages \x3C- \"channel\"\u000A');codeLines.push(' fmt.Println(\x3C-messages)\u000A fmt.Println(\x3C-messages)\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' messages :\u003D make(chan string, 2)\u000A');codeLines.push(' messages \u003C- \"buffered\"\u000A messages \u003C- \"channel\"\u000A');codeLines.push(' fmt.Println(\u003C-messages)\u000A fmt.Println(\u003C-messages)\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/channel-directions generated
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@ -145,7 +145,7 @@ receive on this channel.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func ping(pings chan\x3C- string, msg string) {\u000A pings \x3C- msg\u000A}\u000A');codeLines.push('func pong(pings \x3C-chan string, pongs chan\x3C- string) {\u000A msg :\x3D \x3C-pings\u000A pongs \x3C- msg\u000A}\u000A');codeLines.push('func main() {\u000A pings :\x3D make(chan string, 1)\u000A pongs :\x3D make(chan string, 1)\u000A ping(pings, \"passed message\")\u000A pong(pings, pongs)\u000A fmt.Println(\x3C-pongs)\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func ping(pings chan\u003C- string, msg string) {\u000A pings \u003C- msg\u000A}\u000A');codeLines.push('func pong(pings \u003C-chan string, pongs chan\u003C- string) {\u000A msg :\u003D \u003C-pings\u000A pongs \u003C- msg\u000A}\u000A');codeLines.push('func main() {\u000A pings :\u003D make(chan string, 1)\u000A pongs :\u003D make(chan string, 1)\u000A ping(pings, \"passed message\")\u000A pong(pings, pongs)\u000A fmt.Println(\u003C-pongs)\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/channel-synchronization generated
View File

@ -184,7 +184,7 @@ started.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func worker(done chan bool) {\u000A fmt.Print(\"working...\")\u000A time.Sleep(time.Second)\u000A fmt.Println(\"done\")\u000A');codeLines.push(' done \x3C- true\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' done :\x3D make(chan bool, 1)\u000A go worker(done)\u000A');codeLines.push(' \x3C-done\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func worker(done chan bool) {\u000A fmt.Print(\"working...\")\u000A time.Sleep(time.Second)\u000A fmt.Println(\"done\")\u000A');codeLines.push(' done \u003C- true\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' done :\u003D make(chan bool, 1)\u000A go worker(done)\u000A');codeLines.push(' \u003C-done\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/channels generated
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@ -168,7 +168,7 @@ message without having to use any other synchronization.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' messages :\x3D make(chan string)\u000A');codeLines.push(' go func() { messages \x3C- \"ping\" }()\u000A');codeLines.push(' msg :\x3D \x3C-messages\u000A fmt.Println(msg)\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' messages :\u003D make(chan string)\u000A');codeLines.push(' go func() { messages \u003C- \"ping\" }()\u000A');codeLines.push(' msg :\u003D \u003C-messages\u000A fmt.Println(msg)\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/closing-channels generated
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@ -194,7 +194,7 @@ example: <code>range</code> over channels.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A jobs :\x3D make(chan int, 5)\u000A done :\x3D make(chan bool)\u000A');codeLines.push(' go func() {\u000A for {\u000A j, more :\x3D \x3C-jobs\u000A if more {\u000A fmt.Println(\"received job\", j)\u000A } else {\u000A fmt.Println(\"received all jobs\")\u000A done \x3C- true\u000A return\u000A }\u000A }\u000A }()\u000A');codeLines.push(' for j :\x3D 1; j \x3C\x3D 3; j++ {\u000A jobs \x3C- j\u000A fmt.Println(\"sent job\", j)\u000A }\u000A close(jobs)\u000A fmt.Println(\"sent all jobs\")\u000A');codeLines.push(' \x3C-done\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A jobs :\u003D make(chan int, 5)\u000A done :\u003D make(chan bool)\u000A');codeLines.push(' go func() {\u000A for {\u000A j, more :\u003D \u003C-jobs\u000A if more {\u000A fmt.Println(\"received job\", j)\u000A } else {\u000A fmt.Println(\"received all jobs\")\u000A done \u003C- true\u000A return\u000A }\u000A }\u000A }()\u000A');codeLines.push(' for j :\u003D 1; j \u003C\u003D 3; j++ {\u000A jobs \u003C- j\u000A fmt.Println(\"sent job\", j)\u000A }\u000A close(jobs)\u000A fmt.Println(\"sent all jobs\")\u000A');codeLines.push(' \u003C-done\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/closures generated
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@ -190,7 +190,7 @@ recursion.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func intSeq() func() int {\u000A i :\x3D 0\u000A return func() int {\u000A i++\u000A return i\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' nextInt :\x3D intSeq()\u000A');codeLines.push(' fmt.Println(nextInt())\u000A fmt.Println(nextInt())\u000A fmt.Println(nextInt())\u000A');codeLines.push(' newInts :\x3D intSeq()\u000A fmt.Println(newInts())\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func intSeq() func() int {\u000A i :\u003D 0\u000A return func() int {\u000A i++\u000A return i\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' nextInt :\u003D intSeq()\u000A');codeLines.push(' fmt.Println(nextInt())\u000A fmt.Println(nextInt())\u000A fmt.Println(nextInt())\u000A');codeLines.push(' newInts :\u003D intSeq()\u000A fmt.Println(newInts())\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/collection-functions generated
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@ -371,7 +371,7 @@ type.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('');codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"strings\"\u000A)\u000A');codeLines.push('func Index(vs []string, t string) int {\u000A for i, v :\x3D range vs {\u000A if v \x3D\x3D t {\u000A return i\u000A }\u000A }\u000A return -1\u000A}\u000A');codeLines.push('func Include(vs []string, t string) bool {\u000A return Index(vs, t) \x3E\x3D 0\u000A}\u000A');codeLines.push('func Any(vs []string, f func(string) bool) bool {\u000A for _, v :\x3D range vs {\u000A if f(v) {\u000A return true\u000A }\u000A }\u000A return false\u000A}\u000A');codeLines.push('func All(vs []string, f func(string) bool) bool {\u000A for _, v :\x3D range vs {\u000A if !f(v) {\u000A return false\u000A }\u000A }\u000A return true\u000A}\u000A');codeLines.push('func Filter(vs []string, f func(string) bool) []string {\u000A vsf :\x3D make([]string, 0)\u000A for _, v :\x3D range vs {\u000A if f(v) {\u000A vsf \x3D append(vsf, v)\u000A }\u000A }\u000A return vsf\u000A}\u000A');codeLines.push('func Map(vs []string, f func(string) string) []string {\u000A vsm :\x3D make([]string, len(vs))\u000A for i, v :\x3D range vs {\u000A vsm[i] \x3D f(v)\u000A }\u000A return vsm\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' var strs \x3D []string{\"peach\", \"apple\", \"pear\", \"plum\"}\u000A');codeLines.push(' fmt.Println(Index(strs, \"pear\"))\u000A');codeLines.push(' fmt.Println(Include(strs, \"grape\"))\u000A');codeLines.push(' fmt.Println(Any(strs, func(v string) bool {\u000A return strings.HasPrefix(v, \"p\")\u000A }))\u000A');codeLines.push(' fmt.Println(All(strs, func(v string) bool {\u000A return strings.HasPrefix(v, \"p\")\u000A }))\u000A');codeLines.push(' fmt.Println(Filter(strs, func(v string) bool {\u000A return strings.Contains(v, \"e\")\u000A }))\u000A');codeLines.push(' fmt.Println(Map(strs, strings.ToUpper))\u000A');codeLines.push('}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('');codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"strings\"\u000A)\u000A');codeLines.push('func Index(vs []string, t string) int {\u000A for i, v :\u003D range vs {\u000A if v \u003D\u003D t {\u000A return i\u000A }\u000A }\u000A return -1\u000A}\u000A');codeLines.push('func Include(vs []string, t string) bool {\u000A return Index(vs, t) \u003E\u003D 0\u000A}\u000A');codeLines.push('func Any(vs []string, f func(string) bool) bool {\u000A for _, v :\u003D range vs {\u000A if f(v) {\u000A return true\u000A }\u000A }\u000A return false\u000A}\u000A');codeLines.push('func All(vs []string, f func(string) bool) bool {\u000A for _, v :\u003D range vs {\u000A if !f(v) {\u000A return false\u000A }\u000A }\u000A return true\u000A}\u000A');codeLines.push('func Filter(vs []string, f func(string) bool) []string {\u000A vsf :\u003D make([]string, 0)\u000A for _, v :\u003D range vs {\u000A if f(v) {\u000A vsf \u003D append(vsf, v)\u000A }\u000A }\u000A return vsf\u000A}\u000A');codeLines.push('func Map(vs []string, f func(string) string) []string {\u000A vsm :\u003D make([]string, len(vs))\u000A for i, v :\u003D range vs {\u000A vsm[i] \u003D f(v)\u000A }\u000A return vsm\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' var strs \u003D []string{\"peach\", \"apple\", \"pear\", \"plum\"}\u000A');codeLines.push(' fmt.Println(Index(strs, \"pear\"))\u000A');codeLines.push(' fmt.Println(Include(strs, \"grape\"))\u000A');codeLines.push(' fmt.Println(Any(strs, func(v string) bool {\u000A return strings.HasPrefix(v, \"p\")\u000A }))\u000A');codeLines.push(' fmt.Println(All(strs, func(v string) bool {\u000A return strings.HasPrefix(v, \"p\")\u000A }))\u000A');codeLines.push(' fmt.Println(Filter(strs, func(v string) bool {\u000A return strings.Contains(v, \"e\")\u000A }))\u000A');codeLines.push(' fmt.Println(Map(strs, strings.ToUpper))\u000A');codeLines.push('}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/command-line-arguments generated
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@ -170,7 +170,7 @@ with flags.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"os\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' argsWithProg :\x3D os.Args\u000A argsWithoutProg :\x3D os.Args[1:]\u000A');codeLines.push(' arg :\x3D os.Args[3]\u000A');codeLines.push(' fmt.Println(argsWithProg)\u000A fmt.Println(argsWithoutProg)\u000A fmt.Println(arg)\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"os\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' argsWithProg :\u003D os.Args\u000A argsWithoutProg :\u003D os.Args[1:]\u000A');codeLines.push(' arg :\u003D os.Args[3]\u000A');codeLines.push(' fmt.Println(argsWithProg)\u000A fmt.Println(argsWithoutProg)\u000A fmt.Println(arg)\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/command-line-flags generated
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@ -310,7 +310,7 @@ and show the help text again.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"flag\"\u000A \"fmt\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' wordPtr :\x3D flag.String(\"word\", \"foo\", \"a string\")\u000A');codeLines.push(' numbPtr :\x3D flag.Int(\"numb\", 42, \"an int\")\u000A boolPtr :\x3D flag.Bool(\"fork\", false, \"a bool\")\u000A');codeLines.push(' var svar string\u000A flag.StringVar(\x26svar, \"svar\", \"bar\", \"a string var\")\u000A');codeLines.push(' flag.Parse()\u000A');codeLines.push(' fmt.Println(\"word:\", *wordPtr)\u000A fmt.Println(\"numb:\", *numbPtr)\u000A fmt.Println(\"fork:\", *boolPtr)\u000A fmt.Println(\"svar:\", svar)\u000A fmt.Println(\"tail:\", flag.Args())\u000A}\u000A');codeLines.push('');codeLines.push('');codeLines.push('');codeLines.push('');codeLines.push('');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"flag\"\u000A \"fmt\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' wordPtr :\u003D flag.String(\"word\", \"foo\", \"a string\")\u000A');codeLines.push(' numbPtr :\u003D flag.Int(\"numb\", 42, \"an int\")\u000A boolPtr :\u003D flag.Bool(\"fork\", false, \"a bool\")\u000A');codeLines.push(' var svar string\u000A flag.StringVar(\u0026svar, \"svar\", \"bar\", \"a string var\")\u000A');codeLines.push(' flag.Parse()\u000A');codeLines.push(' fmt.Println(\"word:\", *wordPtr)\u000A fmt.Println(\"numb:\", *numbPtr)\u000A fmt.Println(\"fork:\", *boolPtr)\u000A fmt.Println(\"svar:\", svar)\u000A fmt.Println(\"tail:\", flag.Args())\u000A}\u000A');codeLines.push('');codeLines.push('');codeLines.push('');codeLines.push('');codeLines.push('');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/command-line-subcommands generated
View File

@ -263,7 +263,7 @@ way to parameterize programs.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"flag\"\u000A \"fmt\"\u000A \"os\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' fooCmd :\x3D flag.NewFlagSet(\"foo\", flag.ExitOnError)\u000A fooEnable :\x3D fooCmd.Bool(\"enable\", false, \"enable\")\u000A fooName :\x3D fooCmd.String(\"name\", \"\", \"name\")\u000A');codeLines.push(' barCmd :\x3D flag.NewFlagSet(\"bar\", flag.ExitOnError)\u000A barLevel :\x3D barCmd.Int(\"level\", 0, \"level\")\u000A');codeLines.push(' if len(os.Args) \x3C 2 {\u000A fmt.Println(\"expected \'foo\' or \'bar\' subcommands\")\u000A os.Exit(1)\u000A }\u000A');codeLines.push(' switch os.Args[1] {\u000A');codeLines.push(' case \"foo\":\u000A fooCmd.Parse(os.Args[2:])\u000A fmt.Println(\"subcommand \'foo\'\")\u000A fmt.Println(\" enable:\", *fooEnable)\u000A fmt.Println(\" name:\", *fooName)\u000A fmt.Println(\" tail:\", fooCmd.Args())\u000A case \"bar\":\u000A barCmd.Parse(os.Args[2:])\u000A fmt.Println(\"subcommand \'bar\'\")\u000A fmt.Println(\" level:\", *barLevel)\u000A fmt.Println(\" tail:\", barCmd.Args())\u000A default:\u000A fmt.Println(\"expected \'foo\' or \'bar\' subcommands\")\u000A os.Exit(1)\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');codeLines.push('');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"flag\"\u000A \"fmt\"\u000A \"os\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' fooCmd :\u003D flag.NewFlagSet(\"foo\", flag.ExitOnError)\u000A fooEnable :\u003D fooCmd.Bool(\"enable\", false, \"enable\")\u000A fooName :\u003D fooCmd.String(\"name\", \"\", \"name\")\u000A');codeLines.push(' barCmd :\u003D flag.NewFlagSet(\"bar\", flag.ExitOnError)\u000A barLevel :\u003D barCmd.Int(\"level\", 0, \"level\")\u000A');codeLines.push(' if len(os.Args) \u003C 2 {\u000A fmt.Println(\"expected \'foo\' or \'bar\' subcommands\")\u000A os.Exit(1)\u000A }\u000A');codeLines.push(' switch os.Args[1] {\u000A');codeLines.push(' case \"foo\":\u000A fooCmd.Parse(os.Args[2:])\u000A fmt.Println(\"subcommand \'foo\'\")\u000A fmt.Println(\" enable:\", *fooEnable)\u000A fmt.Println(\" name:\", *fooName)\u000A fmt.Println(\" tail:\", fooCmd.Args())\u000A case \"bar\":\u000A barCmd.Parse(os.Args[2:])\u000A fmt.Println(\"subcommand \'bar\'\")\u000A fmt.Println(\" level:\", *barLevel)\u000A fmt.Println(\" tail:\", barCmd.Args())\u000A default:\u000A fmt.Println(\"expected \'foo\' or \'bar\' subcommands\")\u000A os.Exit(1)\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');codeLines.push('');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/constants generated
View File

@ -183,7 +183,7 @@ assignment or function call. For example, here
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"math\"\u000A)\u000A');codeLines.push('const s string \x3D \"constant\"\u000A');codeLines.push('func main() {\u000A fmt.Println(s)\u000A');codeLines.push(' const n \x3D 500000000\u000A');codeLines.push(' const d \x3D 3e20 / n\u000A fmt.Println(d)\u000A');codeLines.push(' fmt.Println(int64(d))\u000A');codeLines.push(' fmt.Println(math.Sin(n))\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"math\"\u000A)\u000A');codeLines.push('const s string \u003D \"constant\"\u000A');codeLines.push('func main() {\u000A fmt.Println(s)\u000A');codeLines.push(' const n \u003D 500000000\u000A');codeLines.push(' const d \u003D 3e20 / n\u000A fmt.Println(d)\u000A');codeLines.push(' fmt.Println(int64(d))\u000A');codeLines.push(' fmt.Println(math.Sin(n))\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/context generated
View File

@ -205,7 +205,7 @@ cancellation.</p>
</div>
<script>
var codeLines = [];
codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"net/http\"\u000A \"time\"\u000A)\u000A');codeLines.push('func hello(w http.ResponseWriter, req *http.Request) {\u000A');codeLines.push(' ctx :\x3D req.Context()\u000A fmt.Println(\"server: hello handler started\")\u000A defer fmt.Println(\"server: hello handler ended\")\u000A');codeLines.push(' select {\u000A case \x3C-time.After(10 * time.Second):\u000A fmt.Fprintf(w, \"hello\\n\")\u000A case \x3C-ctx.Done():\u000A');codeLines.push(' err :\x3D ctx.Err()\u000A fmt.Println(\"server:\", err)\u000A internalError :\x3D http.StatusInternalServerError\u000A http.Error(w, err.Error(), internalError)\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' http.HandleFunc(\"/hello\", hello)\u000A http.ListenAndServe(\":8090\", nil)\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"net/http\"\u000A \"time\"\u000A)\u000A');codeLines.push('func hello(w http.ResponseWriter, req *http.Request) {\u000A');codeLines.push(' ctx :\u003D req.Context()\u000A fmt.Println(\"server: hello handler started\")\u000A defer fmt.Println(\"server: hello handler ended\")\u000A');codeLines.push(' select {\u000A case \u003C-time.After(10 * time.Second):\u000A fmt.Fprintf(w, \"hello\\n\")\u000A case \u003C-ctx.Done():\u000A');codeLines.push(' err :\u003D ctx.Err()\u000A fmt.Println(\"server:\", err)\u000A internalError :\u003D http.StatusInternalServerError\u000A http.Error(w, err.Error(), internalError)\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' http.HandleFunc(\"/hello\", hello)\u000A http.ListenAndServe(\":8090\", nil)\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/defer generated
View File

@ -212,7 +212,7 @@ after being written.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"os\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' f :\x3D createFile(\"/tmp/defer.txt\")\u000A defer closeFile(f)\u000A writeFile(f)\u000A}\u000A');codeLines.push('func createFile(p string) *os.File {\u000A fmt.Println(\"creating\")\u000A f, err :\x3D os.Create(p)\u000A if err !\x3D nil {\u000A panic(err)\u000A }\u000A return f\u000A}\u000A');codeLines.push('func writeFile(f *os.File) {\u000A fmt.Println(\"writing\")\u000A fmt.Fprintln(f, \"data\")\u000A');codeLines.push('}\u000A');codeLines.push('func closeFile(f *os.File) {\u000A fmt.Println(\"closing\")\u000A err :\x3D f.Close()\u000A');codeLines.push(' if err !\x3D nil {\u000A fmt.Fprintf(os.Stderr, \"error: %v\\n\", err)\u000A os.Exit(1)\u000A }\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"os\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' f :\u003D createFile(\"/tmp/defer.txt\")\u000A defer closeFile(f)\u000A writeFile(f)\u000A}\u000A');codeLines.push('func createFile(p string) *os.File {\u000A fmt.Println(\"creating\")\u000A f, err :\u003D os.Create(p)\u000A if err !\u003D nil {\u000A panic(err)\u000A }\u000A return f\u000A}\u000A');codeLines.push('func writeFile(f *os.File) {\u000A fmt.Println(\"writing\")\u000A fmt.Fprintln(f, \"data\")\u000A');codeLines.push('}\u000A');codeLines.push('func closeFile(f *os.File) {\u000A fmt.Println(\"closing\")\u000A err :\u003D f.Close()\u000A');codeLines.push(' if err !\u003D nil {\u000A fmt.Fprintf(os.Stderr, \"error: %v\\n\", err)\u000A os.Exit(1)\u000A }\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/directories generated
View File

@ -353,7 +353,7 @@ recursively by <code>filepath.Walk</code>.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"io/ioutil\"\u000A \"os\"\u000A \"path/filepath\"\u000A)\u000A');codeLines.push('func check(e error) {\u000A if e !\x3D nil {\u000A panic(e)\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' err :\x3D os.Mkdir(\"subdir\", 0755)\u000A check(err)\u000A');codeLines.push(' defer os.RemoveAll(\"subdir\")\u000A');codeLines.push(' createEmptyFile :\x3D func(name string) {\u000A d :\x3D []byte(\"\")\u000A check(ioutil.WriteFile(name, d, 0644))\u000A }\u000A');codeLines.push(' createEmptyFile(\"subdir/file1\")\u000A');codeLines.push(' err \x3D os.MkdirAll(\"subdir/parent/child\", 0755)\u000A check(err)\u000A');codeLines.push(' createEmptyFile(\"subdir/parent/file2\")\u000A createEmptyFile(\"subdir/parent/file3\")\u000A createEmptyFile(\"subdir/parent/child/file4\")\u000A');codeLines.push(' c, err :\x3D ioutil.ReadDir(\"subdir/parent\")\u000A check(err)\u000A');codeLines.push(' fmt.Println(\"Listing subdir/parent\")\u000A for _, entry :\x3D range c {\u000A fmt.Println(\" \", entry.Name(), entry.IsDir())\u000A }\u000A');codeLines.push(' err \x3D os.Chdir(\"subdir/parent/child\")\u000A check(err)\u000A');codeLines.push(' c, err \x3D ioutil.ReadDir(\".\")\u000A check(err)\u000A');codeLines.push(' fmt.Println(\"Listing subdir/parent/child\")\u000A for _, entry :\x3D range c {\u000A fmt.Println(\" \", entry.Name(), entry.IsDir())\u000A }\u000A');codeLines.push(' err \x3D os.Chdir(\"../../..\")\u000A check(err)\u000A');codeLines.push(' fmt.Println(\"Visiting subdir\")\u000A err \x3D filepath.Walk(\"subdir\", visit)\u000A}\u000A');codeLines.push('func visit(p string, info os.FileInfo, err error) error {\u000A if err !\x3D nil {\u000A return err\u000A }\u000A fmt.Println(\" \", p, info.IsDir())\u000A return nil\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"io/ioutil\"\u000A \"os\"\u000A \"path/filepath\"\u000A)\u000A');codeLines.push('func check(e error) {\u000A if e !\u003D nil {\u000A panic(e)\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' err :\u003D os.Mkdir(\"subdir\", 0755)\u000A check(err)\u000A');codeLines.push(' defer os.RemoveAll(\"subdir\")\u000A');codeLines.push(' createEmptyFile :\u003D func(name string) {\u000A d :\u003D []byte(\"\")\u000A check(ioutil.WriteFile(name, d, 0644))\u000A }\u000A');codeLines.push(' createEmptyFile(\"subdir/file1\")\u000A');codeLines.push(' err \u003D os.MkdirAll(\"subdir/parent/child\", 0755)\u000A check(err)\u000A');codeLines.push(' createEmptyFile(\"subdir/parent/file2\")\u000A createEmptyFile(\"subdir/parent/file3\")\u000A createEmptyFile(\"subdir/parent/child/file4\")\u000A');codeLines.push(' c, err :\u003D ioutil.ReadDir(\"subdir/parent\")\u000A check(err)\u000A');codeLines.push(' fmt.Println(\"Listing subdir/parent\")\u000A for _, entry :\u003D range c {\u000A fmt.Println(\" \", entry.Name(), entry.IsDir())\u000A }\u000A');codeLines.push(' err \u003D os.Chdir(\"subdir/parent/child\")\u000A check(err)\u000A');codeLines.push(' c, err \u003D ioutil.ReadDir(\".\")\u000A check(err)\u000A');codeLines.push(' fmt.Println(\"Listing subdir/parent/child\")\u000A for _, entry :\u003D range c {\u000A fmt.Println(\" \", entry.Name(), entry.IsDir())\u000A }\u000A');codeLines.push(' err \u003D os.Chdir(\"../../..\")\u000A check(err)\u000A');codeLines.push(' fmt.Println(\"Visiting subdir\")\u000A err \u003D filepath.Walk(\"subdir\", visit)\u000A}\u000A');codeLines.push('func visit(p string, info os.FileInfo, err error) error {\u000A if err !\u003D nil {\u000A return err\u000A }\u000A fmt.Println(\" \", p, info.IsDir())\u000A return nil\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/environment-variables generated
View File

@ -186,7 +186,7 @@ program picks that value up.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"os\"\u000A \"strings\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' os.Setenv(\"FOO\", \"1\")\u000A fmt.Println(\"FOO:\", os.Getenv(\"FOO\"))\u000A fmt.Println(\"BAR:\", os.Getenv(\"BAR\"))\u000A');codeLines.push(' fmt.Println()\u000A for _, e :\x3D range os.Environ() {\u000A pair :\x3D strings.SplitN(e, \"\x3D\", 2)\u000A fmt.Println(pair[0])\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"os\"\u000A \"strings\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' os.Setenv(\"FOO\", \"1\")\u000A fmt.Println(\"FOO:\", os.Getenv(\"FOO\"))\u000A fmt.Println(\"BAR:\", os.Getenv(\"BAR\"))\u000A');codeLines.push(' fmt.Println()\u000A for _, e :\u003D range os.Environ() {\u000A pair :\u003D strings.SplitN(e, \"\u003D\", 2)\u000A fmt.Println(pair[0])\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/epoch generated
View File

@ -177,7 +177,7 @@ parsing and formatting.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' now :\x3D time.Now()\u000A secs :\x3D now.Unix()\u000A nanos :\x3D now.UnixNano()\u000A fmt.Println(now)\u000A');codeLines.push(' millis :\x3D nanos / 1000000\u000A fmt.Println(secs)\u000A fmt.Println(millis)\u000A fmt.Println(nanos)\u000A');codeLines.push(' fmt.Println(time.Unix(secs, 0))\u000A fmt.Println(time.Unix(0, nanos))\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' now :\u003D time.Now()\u000A secs :\u003D now.Unix()\u000A nanos :\u003D now.UnixNano()\u000A fmt.Println(now)\u000A');codeLines.push(' millis :\u003D nanos / 1000000\u000A fmt.Println(secs)\u000A fmt.Println(millis)\u000A fmt.Println(nanos)\u000A');codeLines.push(' fmt.Println(time.Unix(secs, 0))\u000A fmt.Println(time.Unix(0, nanos))\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/errors generated
View File

@ -299,7 +299,7 @@ on the Go blog for more on error handling.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"errors\"\u000A \"fmt\"\u000A)\u000A');codeLines.push('func f1(arg int) (int, error) {\u000A if arg \x3D\x3D 42 {\u000A');codeLines.push(' return -1, errors.New(\"can\'t work with 42\")\u000A');codeLines.push(' }\u000A');codeLines.push(' return arg + 3, nil\u000A}\u000A');codeLines.push('type argError struct {\u000A arg int\u000A prob string\u000A}\u000A');codeLines.push('func (e *argError) Error() string {\u000A return fmt.Sprintf(\"%d - %s\", e.arg, e.prob)\u000A}\u000A');codeLines.push('func f2(arg int) (int, error) {\u000A if arg \x3D\x3D 42 {\u000A');codeLines.push(' return -1, \x26argError{arg, \"can\'t work with it\"}\u000A }\u000A return arg + 3, nil\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' for _, i :\x3D range []int{7, 42} {\u000A if r, e :\x3D f1(i); e !\x3D nil {\u000A fmt.Println(\"f1 failed:\", e)\u000A } else {\u000A fmt.Println(\"f1 worked:\", r)\u000A }\u000A }\u000A for _, i :\x3D range []int{7, 42} {\u000A if r, e :\x3D f2(i); e !\x3D nil {\u000A fmt.Println(\"f2 failed:\", e)\u000A } else {\u000A fmt.Println(\"f2 worked:\", r)\u000A }\u000A }\u000A');codeLines.push(' _, e :\x3D f2(42)\u000A if ae, ok :\x3D e.(*argError); ok {\u000A fmt.Println(ae.arg)\u000A fmt.Println(ae.prob)\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"errors\"\u000A \"fmt\"\u000A)\u000A');codeLines.push('func f1(arg int) (int, error) {\u000A if arg \u003D\u003D 42 {\u000A');codeLines.push(' return -1, errors.New(\"can\'t work with 42\")\u000A');codeLines.push(' }\u000A');codeLines.push(' return arg + 3, nil\u000A}\u000A');codeLines.push('type argError struct {\u000A arg int\u000A prob string\u000A}\u000A');codeLines.push('func (e *argError) Error() string {\u000A return fmt.Sprintf(\"%d - %s\", e.arg, e.prob)\u000A}\u000A');codeLines.push('func f2(arg int) (int, error) {\u000A if arg \u003D\u003D 42 {\u000A');codeLines.push(' return -1, \u0026argError{arg, \"can\'t work with it\"}\u000A }\u000A return arg + 3, nil\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' for _, i :\u003D range []int{7, 42} {\u000A if r, e :\u003D f1(i); e !\u003D nil {\u000A fmt.Println(\"f1 failed:\", e)\u000A } else {\u000A fmt.Println(\"f1 worked:\", r)\u000A }\u000A }\u000A for _, i :\u003D range []int{7, 42} {\u000A if r, e :\u003D f2(i); e !\u003D nil {\u000A fmt.Println(\"f2 failed:\", e)\u000A } else {\u000A fmt.Println(\"f2 worked:\", r)\u000A }\u000A }\u000A');codeLines.push(' _, e :\u003D f2(42)\u000A if ae, ok :\u003D e.(*argError); ok {\u000A fmt.Println(ae.arg)\u000A fmt.Println(ae.prob)\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/execing-processes generated
View File

@ -203,7 +203,7 @@ processes covers most use cases for <code>fork</code>.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"os\"\u000A \"os/exec\"\u000A \"syscall\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' binary, lookErr :\x3D exec.LookPath(\"ls\")\u000A if lookErr !\x3D nil {\u000A panic(lookErr)\u000A }\u000A');codeLines.push(' args :\x3D []string{\"ls\", \"-a\", \"-l\", \"-h\"}\u000A');codeLines.push(' env :\x3D os.Environ()\u000A');codeLines.push(' execErr :\x3D syscall.Exec(binary, args, env)\u000A if execErr !\x3D nil {\u000A panic(execErr)\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"os\"\u000A \"os/exec\"\u000A \"syscall\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' binary, lookErr :\u003D exec.LookPath(\"ls\")\u000A if lookErr !\u003D nil {\u000A panic(lookErr)\u000A }\u000A');codeLines.push(' args :\u003D []string{\"ls\", \"-a\", \"-l\", \"-h\"}\u000A');codeLines.push(' env :\u003D os.Environ()\u000A');codeLines.push(' execErr :\u003D syscall.Exec(binary, args, env)\u000A if execErr !\u003D nil {\u000A panic(execErr)\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/file-paths generated
View File

@ -250,7 +250,7 @@ be made relative to base.</p>
</div>
<script>
var codeLines = [];
codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"path/filepath\"\u000A \"strings\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' p :\x3D filepath.Join(\"dir1\", \"dir2\", \"filename\")\u000A fmt.Println(\"p:\", p)\u000A');codeLines.push(' fmt.Println(filepath.Join(\"dir1//\", \"filename\"))\u000A fmt.Println(filepath.Join(\"dir1/../dir1\", \"filename\"))\u000A');codeLines.push(' fmt.Println(\"Dir(p):\", filepath.Dir(p))\u000A fmt.Println(\"Base(p):\", filepath.Base(p))\u000A');codeLines.push(' fmt.Println(filepath.IsAbs(\"dir/file\"))\u000A fmt.Println(filepath.IsAbs(\"/dir/file\"))\u000A');codeLines.push(' filename :\x3D \"config.json\"\u000A');codeLines.push(' ext :\x3D filepath.Ext(filename)\u000A fmt.Println(ext)\u000A');codeLines.push(' fmt.Println(strings.TrimSuffix(filename, ext))\u000A');codeLines.push(' rel, err :\x3D filepath.Rel(\"a/b\", \"a/b/t/file\")\u000A if err !\x3D nil {\u000A panic(err)\u000A }\u000A fmt.Println(rel)\u000A');codeLines.push(' rel, err \x3D filepath.Rel(\"a/b\", \"a/c/t/file\")\u000A if err !\x3D nil {\u000A panic(err)\u000A }\u000A fmt.Println(rel)\u000A}\u000A');codeLines.push('');
codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"path/filepath\"\u000A \"strings\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' p :\u003D filepath.Join(\"dir1\", \"dir2\", \"filename\")\u000A fmt.Println(\"p:\", p)\u000A');codeLines.push(' fmt.Println(filepath.Join(\"dir1//\", \"filename\"))\u000A fmt.Println(filepath.Join(\"dir1/../dir1\", \"filename\"))\u000A');codeLines.push(' fmt.Println(\"Dir(p):\", filepath.Dir(p))\u000A fmt.Println(\"Base(p):\", filepath.Base(p))\u000A');codeLines.push(' fmt.Println(filepath.IsAbs(\"dir/file\"))\u000A fmt.Println(filepath.IsAbs(\"/dir/file\"))\u000A');codeLines.push(' filename :\u003D \"config.json\"\u000A');codeLines.push(' ext :\u003D filepath.Ext(filename)\u000A fmt.Println(ext)\u000A');codeLines.push(' fmt.Println(strings.TrimSuffix(filename, ext))\u000A');codeLines.push(' rel, err :\u003D filepath.Rel(\"a/b\", \"a/b/t/file\")\u000A if err !\u003D nil {\u000A panic(err)\u000A }\u000A fmt.Println(rel)\u000A');codeLines.push(' rel, err \u003D filepath.Rel(\"a/b\", \"a/c/t/file\")\u000A if err !\u003D nil {\u000A panic(err)\u000A }\u000A fmt.Println(rel)\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/for generated
View File

@ -195,7 +195,7 @@ structures.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' i :\x3D 1\u000A for i \x3C\x3D 3 {\u000A fmt.Println(i)\u000A i \x3D i + 1\u000A }\u000A');codeLines.push(' for j :\x3D 7; j \x3C\x3D 9; j++ {\u000A fmt.Println(j)\u000A }\u000A');codeLines.push(' for {\u000A fmt.Println(\"loop\")\u000A break\u000A }\u000A');codeLines.push(' for n :\x3D 0; n \x3C\x3D 5; n++ {\u000A if n%2 \x3D\x3D 0 {\u000A continue\u000A }\u000A fmt.Println(n)\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' i :\u003D 1\u000A for i \u003C\u003D 3 {\u000A fmt.Println(i)\u000A i \u003D i + 1\u000A }\u000A');codeLines.push(' for j :\u003D 7; j \u003C\u003D 9; j++ {\u000A fmt.Println(j)\u000A }\u000A');codeLines.push(' for {\u000A fmt.Println(\"loop\")\u000A break\u000A }\u000A');codeLines.push(' for n :\u003D 0; n \u003C\u003D 5; n++ {\u000A if n%2 \u003D\u003D 0 {\u000A continue\u000A }\u000A fmt.Println(n)\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/functions generated
View File

@ -193,7 +193,7 @@ multiple return values, which we&rsquo;ll look at next.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func plus(a int, b int) int {\u000A');codeLines.push(' return a + b\u000A}\u000A');codeLines.push('func plusPlus(a, b, c int) int {\u000A return a + b + c\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' res :\x3D plus(1, 2)\u000A fmt.Println(\"1+2 \x3D\", res)\u000A');codeLines.push(' res \x3D plusPlus(1, 2, 3)\u000A fmt.Println(\"1+2+3 \x3D\", res)\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func plus(a int, b int) int {\u000A');codeLines.push(' return a + b\u000A}\u000A');codeLines.push('func plusPlus(a, b, c int) int {\u000A return a + b + c\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' res :\u003D plus(1, 2)\u000A fmt.Println(\"1+2 \u003D\", res)\u000A');codeLines.push(' res \u003D plusPlus(1, 2, 3)\u000A fmt.Println(\"1+2+3 \u003D\", res)\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/goroutines generated
View File

@ -207,7 +207,7 @@ concurrent Go programs: channels.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func f(from string) {\u000A for i :\x3D 0; i \x3C 3; i++ {\u000A fmt.Println(from, \":\", i)\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' f(\"direct\")\u000A');codeLines.push(' go f(\"goroutine\")\u000A');codeLines.push(' go func(msg string) {\u000A fmt.Println(msg)\u000A }(\"going\")\u000A');codeLines.push(' time.Sleep(time.Second)\u000A fmt.Println(\"done\")\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func f(from string) {\u000A for i :\u003D 0; i \u003C 3; i++ {\u000A fmt.Println(from, \":\", i)\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' f(\"direct\")\u000A');codeLines.push(' go f(\"goroutine\")\u000A');codeLines.push(' go func(msg string) {\u000A fmt.Println(msg)\u000A }(\"going\")\u000A');codeLines.push(' time.Sleep(time.Second)\u000A fmt.Println(\"done\")\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/http-clients generated
View File

@ -169,7 +169,7 @@ settings.</p>
</div>
<script>
var codeLines = [];
codeLines.push('package main\u000A');codeLines.push('import (\u000A \"bufio\"\u000A \"fmt\"\u000A \"net/http\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' resp, err :\x3D http.Get(\"http://gobyexample.com\")\u000A if err !\x3D nil {\u000A panic(err)\u000A }\u000A defer resp.Body.Close()\u000A');codeLines.push(' fmt.Println(\"Response status:\", resp.Status)\u000A');codeLines.push(' scanner :\x3D bufio.NewScanner(resp.Body)\u000A for i :\x3D 0; scanner.Scan() \x26\x26 i \x3C 5; i++ {\u000A fmt.Println(scanner.Text())\u000A }\u000A');codeLines.push(' if err :\x3D scanner.Err(); err !\x3D nil {\u000A panic(err)\u000A }\u000A}\u000A');codeLines.push('');
codeLines.push('package main\u000A');codeLines.push('import (\u000A \"bufio\"\u000A \"fmt\"\u000A \"net/http\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' resp, err :\u003D http.Get(\"http://gobyexample.com\")\u000A if err !\u003D nil {\u000A panic(err)\u000A }\u000A defer resp.Body.Close()\u000A');codeLines.push(' fmt.Println(\"Response status:\", resp.Status)\u000A');codeLines.push(' scanner :\u003D bufio.NewScanner(resp.Body)\u000A for i :\u003D 0; scanner.Scan() \u0026\u0026 i \u003C 5; i++ {\u000A fmt.Println(scanner.Text())\u000A }\u000A');codeLines.push(' if err :\u003D scanner.Err(); err !\u003D nil {\u000A panic(err)\u000A }\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/http-servers generated
View File

@ -210,7 +210,7 @@ router we&rsquo;ve just set up.</p>
</div>
<script>
var codeLines = [];
codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"net/http\"\u000A)\u000A');codeLines.push('func hello(w http.ResponseWriter, req *http.Request) {\u000A');codeLines.push(' fmt.Fprintf(w, \"hello\\n\")\u000A}\u000A');codeLines.push('func headers(w http.ResponseWriter, req *http.Request) {\u000A');codeLines.push(' for name, headers :\x3D range req.Header {\u000A for _, h :\x3D range headers {\u000A fmt.Fprintf(w, \"%v: %v\\n\", name, h)\u000A }\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' http.HandleFunc(\"/hello\", hello)\u000A http.HandleFunc(\"/headers\", headers)\u000A');codeLines.push(' http.ListenAndServe(\":8090\", nil)\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"net/http\"\u000A)\u000A');codeLines.push('func hello(w http.ResponseWriter, req *http.Request) {\u000A');codeLines.push(' fmt.Fprintf(w, \"hello\\n\")\u000A}\u000A');codeLines.push('func headers(w http.ResponseWriter, req *http.Request) {\u000A');codeLines.push(' for name, headers :\u003D range req.Header {\u000A for _, h :\u003D range headers {\u000A fmt.Fprintf(w, \"%v: %v\\n\", name, h)\u000A }\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' http.HandleFunc(\"/hello\", hello)\u000A http.HandleFunc(\"/headers\", headers)\u000A');codeLines.push(' http.ListenAndServe(\":8090\", nil)\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/if-else generated
View File

@ -184,7 +184,7 @@ for basic conditions.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' if 7%2 \x3D\x3D 0 {\u000A fmt.Println(\"7 is even\")\u000A } else {\u000A fmt.Println(\"7 is odd\")\u000A }\u000A');codeLines.push(' if 8%4 \x3D\x3D 0 {\u000A fmt.Println(\"8 is divisible by 4\")\u000A }\u000A');codeLines.push(' if num :\x3D 9; num \x3C 0 {\u000A fmt.Println(num, \"is negative\")\u000A } else if num \x3C 10 {\u000A fmt.Println(num, \"has 1 digit\")\u000A } else {\u000A fmt.Println(num, \"has multiple digits\")\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' if 7%2 \u003D\u003D 0 {\u000A fmt.Println(\"7 is even\")\u000A } else {\u000A fmt.Println(\"7 is odd\")\u000A }\u000A');codeLines.push(' if 8%4 \u003D\u003D 0 {\u000A fmt.Println(\"8 is divisible by 4\")\u000A }\u000A');codeLines.push(' if num :\u003D 9; num \u003C 0 {\u000A fmt.Println(num, \"is negative\")\u000A } else if num \u003C 10 {\u000A fmt.Println(num, \"has 1 digit\")\u000A } else {\u000A fmt.Println(num, \"has multiple digits\")\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

4
public/index.html generated
View File

@ -12,6 +12,10 @@
<a href="http://golang.org">Go</a> is an
open source programming language designed for
building simple, fast, and reliable software.
Please read the official
<a href="https://golang.org/doc/tutorial/getting-started">documentation</a>
to learn a bit about Go code, tools packages,
and modules.
</p>
<p>

2
public/interfaces generated
View File

@ -236,7 +236,7 @@ these structs as arguments to <code>measure</code>.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"math\"\u000A)\u000A');codeLines.push('type geometry interface {\u000A area() float64\u000A perim() float64\u000A}\u000A');codeLines.push('type rect struct {\u000A width, height float64\u000A}\u000Atype circle struct {\u000A radius float64\u000A}\u000A');codeLines.push('func (r rect) area() float64 {\u000A return r.width * r.height\u000A}\u000Afunc (r rect) perim() float64 {\u000A return 2*r.width + 2*r.height\u000A}\u000A');codeLines.push('func (c circle) area() float64 {\u000A return math.Pi * c.radius * c.radius\u000A}\u000Afunc (c circle) perim() float64 {\u000A return 2 * math.Pi * c.radius\u000A}\u000A');codeLines.push('func measure(g geometry) {\u000A fmt.Println(g)\u000A fmt.Println(g.area())\u000A fmt.Println(g.perim())\u000A}\u000A');codeLines.push('func main() {\u000A r :\x3D rect{width: 3, height: 4}\u000A c :\x3D circle{radius: 5}\u000A');codeLines.push(' measure(r)\u000A measure(c)\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"math\"\u000A)\u000A');codeLines.push('type geometry interface {\u000A area() float64\u000A perim() float64\u000A}\u000A');codeLines.push('type rect struct {\u000A width, height float64\u000A}\u000Atype circle struct {\u000A radius float64\u000A}\u000A');codeLines.push('func (r rect) area() float64 {\u000A return r.width * r.height\u000A}\u000Afunc (r rect) perim() float64 {\u000A return 2*r.width + 2*r.height\u000A}\u000A');codeLines.push('func (c circle) area() float64 {\u000A return math.Pi * c.radius * c.radius\u000A}\u000Afunc (c circle) perim() float64 {\u000A return 2 * math.Pi * c.radius\u000A}\u000A');codeLines.push('func measure(g geometry) {\u000A fmt.Println(g)\u000A fmt.Println(g.area())\u000A fmt.Println(g.perim())\u000A}\u000A');codeLines.push('func main() {\u000A r :\u003D rect{width: 3, height: 4}\u000A c :\u003D circle{radius: 5}\u000A');codeLines.push(' measure(r)\u000A measure(c)\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/json generated
View File

@ -416,7 +416,7 @@ for more.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"encoding/json\"\u000A \"fmt\"\u000A \"os\"\u000A)\u000A');codeLines.push('type response1 struct {\u000A Page int\u000A Fruits []string\u000A}\u000A');codeLines.push('type response2 struct {\u000A Page int `json:\"page\"`\u000A Fruits []string `json:\"fruits\"`\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' bolB, _ :\x3D json.Marshal(true)\u000A fmt.Println(string(bolB))\u000A');codeLines.push(' intB, _ :\x3D json.Marshal(1)\u000A fmt.Println(string(intB))\u000A');codeLines.push(' fltB, _ :\x3D json.Marshal(2.34)\u000A fmt.Println(string(fltB))\u000A');codeLines.push(' strB, _ :\x3D json.Marshal(\"gopher\")\u000A fmt.Println(string(strB))\u000A');codeLines.push(' slcD :\x3D []string{\"apple\", \"peach\", \"pear\"}\u000A slcB, _ :\x3D json.Marshal(slcD)\u000A fmt.Println(string(slcB))\u000A');codeLines.push(' mapD :\x3D map[string]int{\"apple\": 5, \"lettuce\": 7}\u000A mapB, _ :\x3D json.Marshal(mapD)\u000A fmt.Println(string(mapB))\u000A');codeLines.push(' res1D :\x3D \x26response1{\u000A Page: 1,\u000A Fruits: []string{\"apple\", \"peach\", \"pear\"}}\u000A res1B, _ :\x3D json.Marshal(res1D)\u000A fmt.Println(string(res1B))\u000A');codeLines.push(' res2D :\x3D \x26response2{\u000A Page: 1,\u000A Fruits: []string{\"apple\", \"peach\", \"pear\"}}\u000A res2B, _ :\x3D json.Marshal(res2D)\u000A fmt.Println(string(res2B))\u000A');codeLines.push(' byt :\x3D []byte(`{\"num\":6.13,\"strs\":[\"a\",\"b\"]}`)\u000A');codeLines.push(' var dat map[string]interface{}\u000A');codeLines.push(' if err :\x3D json.Unmarshal(byt, \x26dat); err !\x3D nil {\u000A panic(err)\u000A }\u000A fmt.Println(dat)\u000A');codeLines.push(' num :\x3D dat[\"num\"].(float64)\u000A fmt.Println(num)\u000A');codeLines.push(' strs :\x3D dat[\"strs\"].([]interface{})\u000A str1 :\x3D strs[0].(string)\u000A fmt.Println(str1)\u000A');codeLines.push(' str :\x3D `{\"page\": 1, \"fruits\": [\"apple\", \"peach\"]}`\u000A res :\x3D response2{}\u000A json.Unmarshal([]byte(str), \x26res)\u000A fmt.Println(res)\u000A fmt.Println(res.Fruits[0])\u000A');codeLines.push(' enc :\x3D json.NewEncoder(os.Stdout)\u000A d :\x3D map[string]int{\"apple\": 5, \"lettuce\": 7}\u000A enc.Encode(d)\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"encoding/json\"\u000A \"fmt\"\u000A \"os\"\u000A)\u000A');codeLines.push('type response1 struct {\u000A Page int\u000A Fruits []string\u000A}\u000A');codeLines.push('type response2 struct {\u000A Page int `json:\"page\"`\u000A Fruits []string `json:\"fruits\"`\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' bolB, _ :\u003D json.Marshal(true)\u000A fmt.Println(string(bolB))\u000A');codeLines.push(' intB, _ :\u003D json.Marshal(1)\u000A fmt.Println(string(intB))\u000A');codeLines.push(' fltB, _ :\u003D json.Marshal(2.34)\u000A fmt.Println(string(fltB))\u000A');codeLines.push(' strB, _ :\u003D json.Marshal(\"gopher\")\u000A fmt.Println(string(strB))\u000A');codeLines.push(' slcD :\u003D []string{\"apple\", \"peach\", \"pear\"}\u000A slcB, _ :\u003D json.Marshal(slcD)\u000A fmt.Println(string(slcB))\u000A');codeLines.push(' mapD :\u003D map[string]int{\"apple\": 5, \"lettuce\": 7}\u000A mapB, _ :\u003D json.Marshal(mapD)\u000A fmt.Println(string(mapB))\u000A');codeLines.push(' res1D :\u003D \u0026response1{\u000A Page: 1,\u000A Fruits: []string{\"apple\", \"peach\", \"pear\"}}\u000A res1B, _ :\u003D json.Marshal(res1D)\u000A fmt.Println(string(res1B))\u000A');codeLines.push(' res2D :\u003D \u0026response2{\u000A Page: 1,\u000A Fruits: []string{\"apple\", \"peach\", \"pear\"}}\u000A res2B, _ :\u003D json.Marshal(res2D)\u000A fmt.Println(string(res2B))\u000A');codeLines.push(' byt :\u003D []byte(`{\"num\":6.13,\"strs\":[\"a\",\"b\"]}`)\u000A');codeLines.push(' var dat map[string]interface{}\u000A');codeLines.push(' if err :\u003D json.Unmarshal(byt, \u0026dat); err !\u003D nil {\u000A panic(err)\u000A }\u000A fmt.Println(dat)\u000A');codeLines.push(' num :\u003D dat[\"num\"].(float64)\u000A fmt.Println(num)\u000A');codeLines.push(' strs :\u003D dat[\"strs\"].([]interface{})\u000A str1 :\u003D strs[0].(string)\u000A fmt.Println(str1)\u000A');codeLines.push(' str :\u003D `{\"page\": 1, \"fruits\": [\"apple\", \"peach\"]}`\u000A res :\u003D response2{}\u000A json.Unmarshal([]byte(str), \u0026res)\u000A fmt.Println(res)\u000A fmt.Println(res.Fruits[0])\u000A');codeLines.push(' enc :\u003D json.NewEncoder(os.Stdout)\u000A d :\u003D map[string]int{\"apple\": 5, \"lettuce\": 7}\u000A enc.Encode(d)\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/line-filters generated
View File

@ -204,7 +204,7 @@ lowercase lines.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"bufio\"\u000A \"fmt\"\u000A \"os\"\u000A \"strings\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' scanner :\x3D bufio.NewScanner(os.Stdin)\u000A');codeLines.push(' for scanner.Scan() {\u000A');codeLines.push(' ucl :\x3D strings.ToUpper(scanner.Text())\u000A');codeLines.push(' fmt.Println(ucl)\u000A }\u000A');codeLines.push(' if err :\x3D scanner.Err(); err !\x3D nil {\u000A fmt.Fprintln(os.Stderr, \"error:\", err)\u000A os.Exit(1)\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"bufio\"\u000A \"fmt\"\u000A \"os\"\u000A \"strings\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' scanner :\u003D bufio.NewScanner(os.Stdin)\u000A');codeLines.push(' for scanner.Scan() {\u000A');codeLines.push(' ucl :\u003D strings.ToUpper(scanner.Text())\u000A');codeLines.push(' fmt.Println(ucl)\u000A }\u000A');codeLines.push(' if err :\u003D scanner.Err(); err !\u003D nil {\u000A fmt.Fprintln(os.Stderr, \"error:\", err)\u000A os.Exit(1)\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/maps generated
View File

@ -232,7 +232,7 @@ printed with <code>fmt.Println</code>.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' m :\x3D make(map[string]int)\u000A');codeLines.push(' m[\"k1\"] \x3D 7\u000A m[\"k2\"] \x3D 13\u000A');codeLines.push(' fmt.Println(\"map:\", m)\u000A');codeLines.push(' v1 :\x3D m[\"k1\"]\u000A fmt.Println(\"v1: \", v1)\u000A');codeLines.push(' fmt.Println(\"len:\", len(m))\u000A');codeLines.push(' delete(m, \"k2\")\u000A fmt.Println(\"map:\", m)\u000A');codeLines.push(' _, prs :\x3D m[\"k2\"]\u000A fmt.Println(\"prs:\", prs)\u000A');codeLines.push(' n :\x3D map[string]int{\"foo\": 1, \"bar\": 2}\u000A fmt.Println(\"map:\", n)\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' m :\u003D make(map[string]int)\u000A');codeLines.push(' m[\"k1\"] \u003D 7\u000A m[\"k2\"] \u003D 13\u000A');codeLines.push(' fmt.Println(\"map:\", m)\u000A');codeLines.push(' v1 :\u003D m[\"k1\"]\u000A fmt.Println(\"v1: \", v1)\u000A');codeLines.push(' fmt.Println(\"len:\", len(m))\u000A');codeLines.push(' delete(m, \"k2\")\u000A fmt.Println(\"map:\", m)\u000A');codeLines.push(' _, prs :\u003D m[\"k2\"]\u000A fmt.Println(\"prs:\", prs)\u000A');codeLines.push(' n :\u003D map[string]int{\"foo\": 1, \"bar\": 2}\u000A fmt.Println(\"map:\", n)\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/methods generated
View File

@ -197,7 +197,7 @@ naming related sets of methods: interfaces.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('type rect struct {\u000A width, height int\u000A}\u000A');codeLines.push('func (r *rect) area() int {\u000A return r.width * r.height\u000A}\u000A');codeLines.push('func (r rect) perim() int {\u000A return 2*r.width + 2*r.height\u000A}\u000A');codeLines.push('func main() {\u000A r :\x3D rect{width: 10, height: 5}\u000A');codeLines.push(' fmt.Println(\"area: \", r.area())\u000A fmt.Println(\"perim:\", r.perim())\u000A');codeLines.push(' rp :\x3D \x26r\u000A fmt.Println(\"area: \", rp.area())\u000A fmt.Println(\"perim:\", rp.perim())\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('type rect struct {\u000A width, height int\u000A}\u000A');codeLines.push('func (r *rect) area() int {\u000A return r.width * r.height\u000A}\u000A');codeLines.push('func (r rect) perim() int {\u000A return 2*r.width + 2*r.height\u000A}\u000A');codeLines.push('func main() {\u000A r :\u003D rect{width: 10, height: 5}\u000A');codeLines.push(' fmt.Println(\"area: \", r.area())\u000A fmt.Println(\"perim:\", r.perim())\u000A');codeLines.push(' rp :\u003D \u0026r\u000A fmt.Println(\"area: \", rp.area())\u000A fmt.Println(\"perim:\", rp.perim())\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/multiple-return-values generated
View File

@ -166,7 +166,7 @@ feature of Go functions; we&rsquo;ll look at this next.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func vals() (int, int) {\u000A return 3, 7\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' a, b :\x3D vals()\u000A fmt.Println(a)\u000A fmt.Println(b)\u000A');codeLines.push(' _, c :\x3D vals()\u000A fmt.Println(c)\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func vals() (int, int) {\u000A return 3, 7\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' a, b :\u003D vals()\u000A fmt.Println(a)\u000A fmt.Println(b)\u000A');codeLines.push(' _, c :\u003D vals()\u000A fmt.Println(c)\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/mutexes generated
View File

@ -297,7 +297,7 @@ management task using only goroutines and channels.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"math/rand\"\u000A \"sync\"\u000A \"sync/atomic\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' var state \x3D make(map[int]int)\u000A');codeLines.push(' var mutex \x3D \x26sync.Mutex{}\u000A');codeLines.push(' var readOps uint64\u000A var writeOps uint64\u000A');codeLines.push(' for r :\x3D 0; r \x3C 100; r++ {\u000A go func() {\u000A total :\x3D 0\u000A for {\u000A');codeLines.push(' key :\x3D rand.Intn(5)\u000A mutex.Lock()\u000A total +\x3D state[key]\u000A mutex.Unlock()\u000A atomic.AddUint64(\x26readOps, 1)\u000A');codeLines.push(' time.Sleep(time.Millisecond)\u000A }\u000A }()\u000A }\u000A');codeLines.push(' for w :\x3D 0; w \x3C 10; w++ {\u000A go func() {\u000A for {\u000A key :\x3D rand.Intn(5)\u000A val :\x3D rand.Intn(100)\u000A mutex.Lock()\u000A state[key] \x3D val\u000A mutex.Unlock()\u000A atomic.AddUint64(\x26writeOps, 1)\u000A time.Sleep(time.Millisecond)\u000A }\u000A }()\u000A }\u000A');codeLines.push(' time.Sleep(time.Second)\u000A');codeLines.push(' readOpsFinal :\x3D atomic.LoadUint64(\x26readOps)\u000A fmt.Println(\"readOps:\", readOpsFinal)\u000A writeOpsFinal :\x3D atomic.LoadUint64(\x26writeOps)\u000A fmt.Println(\"writeOps:\", writeOpsFinal)\u000A');codeLines.push(' mutex.Lock()\u000A fmt.Println(\"state:\", state)\u000A mutex.Unlock()\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"math/rand\"\u000A \"sync\"\u000A \"sync/atomic\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' var state \u003D make(map[int]int)\u000A');codeLines.push(' var mutex \u003D \u0026sync.Mutex{}\u000A');codeLines.push(' var readOps uint64\u000A var writeOps uint64\u000A');codeLines.push(' for r :\u003D 0; r \u003C 100; r++ {\u000A go func() {\u000A total :\u003D 0\u000A for {\u000A');codeLines.push(' key :\u003D rand.Intn(5)\u000A mutex.Lock()\u000A total +\u003D state[key]\u000A mutex.Unlock()\u000A atomic.AddUint64(\u0026readOps, 1)\u000A');codeLines.push(' time.Sleep(time.Millisecond)\u000A }\u000A }()\u000A }\u000A');codeLines.push(' for w :\u003D 0; w \u003C 10; w++ {\u000A go func() {\u000A for {\u000A key :\u003D rand.Intn(5)\u000A val :\u003D rand.Intn(100)\u000A mutex.Lock()\u000A state[key] \u003D val\u000A mutex.Unlock()\u000A atomic.AddUint64(\u0026writeOps, 1)\u000A time.Sleep(time.Millisecond)\u000A }\u000A }()\u000A }\u000A');codeLines.push(' time.Sleep(time.Second)\u000A');codeLines.push(' readOpsFinal :\u003D atomic.LoadUint64(\u0026readOps)\u000A fmt.Println(\"readOps:\", readOpsFinal)\u000A writeOpsFinal :\u003D atomic.LoadUint64(\u0026writeOps)\u000A fmt.Println(\"writeOps:\", writeOpsFinal)\u000A');codeLines.push(' mutex.Lock()\u000A fmt.Println(\"state:\", state)\u000A mutex.Unlock()\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/non-blocking-channel-operations generated
View File

@ -176,7 +176,7 @@ on both <code>messages</code> and <code>signals</code>.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A messages :\x3D make(chan string)\u000A signals :\x3D make(chan bool)\u000A');codeLines.push(' select {\u000A case msg :\x3D \x3C-messages:\u000A fmt.Println(\"received message\", msg)\u000A default:\u000A fmt.Println(\"no message received\")\u000A }\u000A');codeLines.push(' msg :\x3D \"hi\"\u000A select {\u000A case messages \x3C- msg:\u000A fmt.Println(\"sent message\", msg)\u000A default:\u000A fmt.Println(\"no message sent\")\u000A }\u000A');codeLines.push(' select {\u000A case msg :\x3D \x3C-messages:\u000A fmt.Println(\"received message\", msg)\u000A case sig :\x3D \x3C-signals:\u000A fmt.Println(\"received signal\", sig)\u000A default:\u000A fmt.Println(\"no activity\")\u000A }\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A messages :\u003D make(chan string)\u000A signals :\u003D make(chan bool)\u000A');codeLines.push(' select {\u000A case msg :\u003D \u003C-messages:\u000A fmt.Println(\"received message\", msg)\u000A default:\u000A fmt.Println(\"no message received\")\u000A }\u000A');codeLines.push(' msg :\u003D \"hi\"\u000A select {\u000A case messages \u003C- msg:\u000A fmt.Println(\"sent message\", msg)\u000A default:\u000A fmt.Println(\"no message sent\")\u000A }\u000A');codeLines.push(' select {\u000A case msg :\u003D \u003C-messages:\u000A fmt.Println(\"received message\", msg)\u000A case sig :\u003D \u003C-signals:\u000A fmt.Println(\"received signal\", sig)\u000A default:\u000A fmt.Println(\"no activity\")\u000A }\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/number-parsing generated
View File

@ -213,7 +213,7 @@ bits.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"strconv\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' f, _ :\x3D strconv.ParseFloat(\"1.234\", 64)\u000A fmt.Println(f)\u000A');codeLines.push(' i, _ :\x3D strconv.ParseInt(\"123\", 0, 64)\u000A fmt.Println(i)\u000A');codeLines.push(' d, _ :\x3D strconv.ParseInt(\"0x1c8\", 0, 64)\u000A fmt.Println(d)\u000A');codeLines.push(' u, _ :\x3D strconv.ParseUint(\"789\", 0, 64)\u000A fmt.Println(u)\u000A');codeLines.push(' k, _ :\x3D strconv.Atoi(\"135\")\u000A fmt.Println(k)\u000A');codeLines.push(' _, e :\x3D strconv.Atoi(\"wat\")\u000A fmt.Println(e)\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"strconv\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' f, _ :\u003D strconv.ParseFloat(\"1.234\", 64)\u000A fmt.Println(f)\u000A');codeLines.push(' i, _ :\u003D strconv.ParseInt(\"123\", 0, 64)\u000A fmt.Println(i)\u000A');codeLines.push(' d, _ :\u003D strconv.ParseInt(\"0x1c8\", 0, 64)\u000A fmt.Println(d)\u000A');codeLines.push(' u, _ :\u003D strconv.ParseUint(\"789\", 0, 64)\u000A fmt.Println(u)\u000A');codeLines.push(' k, _ :\u003D strconv.Atoi(\"135\")\u000A fmt.Println(k)\u000A');codeLines.push(' _, e :\u003D strconv.Atoi(\"wat\")\u000A fmt.Println(e)\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/panic generated
View File

@ -172,7 +172,7 @@ to use error-indicating return values wherever possible.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"os\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' panic(\"a problem\")\u000A');codeLines.push(' _, err :\x3D os.Create(\"/tmp/file\")\u000A if err !\x3D nil {\u000A panic(err)\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"os\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' panic(\"a problem\")\u000A');codeLines.push(' _, err :\u003D os.Create(\"/tmp/file\")\u000A if err !\u003D nil {\u000A panic(err)\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/pointers generated
View File

@ -193,7 +193,7 @@ the memory address for that variable.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func zeroval(ival int) {\u000A ival \x3D 0\u000A}\u000A');codeLines.push('func zeroptr(iptr *int) {\u000A *iptr \x3D 0\u000A}\u000A');codeLines.push('func main() {\u000A i :\x3D 1\u000A fmt.Println(\"initial:\", i)\u000A');codeLines.push(' zeroval(i)\u000A fmt.Println(\"zeroval:\", i)\u000A');codeLines.push(' zeroptr(\x26i)\u000A fmt.Println(\"zeroptr:\", i)\u000A');codeLines.push(' fmt.Println(\"pointer:\", \x26i)\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func zeroval(ival int) {\u000A ival \u003D 0\u000A}\u000A');codeLines.push('func zeroptr(iptr *int) {\u000A *iptr \u003D 0\u000A}\u000A');codeLines.push('func main() {\u000A i :\u003D 1\u000A fmt.Println(\"initial:\", i)\u000A');codeLines.push(' zeroval(i)\u000A fmt.Println(\"zeroval:\", i)\u000A');codeLines.push(' zeroptr(\u0026i)\u000A fmt.Println(\"zeroptr:\", i)\u000A');codeLines.push(' fmt.Println(\"pointer:\", \u0026i)\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/random-numbers generated
View File

@ -229,7 +229,7 @@ that Go can provide.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"math/rand\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' fmt.Print(rand.Intn(100), \",\")\u000A fmt.Print(rand.Intn(100))\u000A fmt.Println()\u000A');codeLines.push(' fmt.Println(rand.Float64())\u000A');codeLines.push(' fmt.Print((rand.Float64()*5)+5, \",\")\u000A fmt.Print((rand.Float64() * 5) + 5)\u000A fmt.Println()\u000A');codeLines.push(' s1 :\x3D rand.NewSource(time.Now().UnixNano())\u000A r1 :\x3D rand.New(s1)\u000A');codeLines.push(' fmt.Print(r1.Intn(100), \",\")\u000A fmt.Print(r1.Intn(100))\u000A fmt.Println()\u000A');codeLines.push(' s2 :\x3D rand.NewSource(42)\u000A r2 :\x3D rand.New(s2)\u000A fmt.Print(r2.Intn(100), \",\")\u000A fmt.Print(r2.Intn(100))\u000A fmt.Println()\u000A s3 :\x3D rand.NewSource(42)\u000A r3 :\x3D rand.New(s3)\u000A fmt.Print(r3.Intn(100), \",\")\u000A fmt.Print(r3.Intn(100))\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"math/rand\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' fmt.Print(rand.Intn(100), \",\")\u000A fmt.Print(rand.Intn(100))\u000A fmt.Println()\u000A');codeLines.push(' fmt.Println(rand.Float64())\u000A');codeLines.push(' fmt.Print((rand.Float64()*5)+5, \",\")\u000A fmt.Print((rand.Float64() * 5) + 5)\u000A fmt.Println()\u000A');codeLines.push(' s1 :\u003D rand.NewSource(time.Now().UnixNano())\u000A r1 :\u003D rand.New(s1)\u000A');codeLines.push(' fmt.Print(r1.Intn(100), \",\")\u000A fmt.Print(r1.Intn(100))\u000A fmt.Println()\u000A');codeLines.push(' s2 :\u003D rand.NewSource(42)\u000A r2 :\u003D rand.New(s2)\u000A fmt.Print(r2.Intn(100), \",\")\u000A fmt.Print(r2.Intn(100))\u000A fmt.Println()\u000A s3 :\u003D rand.NewSource(42)\u000A r3 :\u003D rand.New(s3)\u000A fmt.Print(r3.Intn(100), \",\")\u000A fmt.Print(r3.Intn(100))\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/range generated
View File

@ -200,7 +200,7 @@ of the <code>rune</code> and the second the <code>rune</code> itself.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' nums :\x3D []int{2, 3, 4}\u000A sum :\x3D 0\u000A for _, num :\x3D range nums {\u000A sum +\x3D num\u000A }\u000A fmt.Println(\"sum:\", sum)\u000A');codeLines.push(' for i, num :\x3D range nums {\u000A if num \x3D\x3D 3 {\u000A fmt.Println(\"index:\", i)\u000A }\u000A }\u000A');codeLines.push(' kvs :\x3D map[string]string{\"a\": \"apple\", \"b\": \"banana\"}\u000A for k, v :\x3D range kvs {\u000A fmt.Printf(\"%s -\x3E %s\\n\", k, v)\u000A }\u000A');codeLines.push(' for k :\x3D range kvs {\u000A fmt.Println(\"key:\", k)\u000A }\u000A');codeLines.push(' for i, c :\x3D range \"go\" {\u000A fmt.Println(i, c)\u000A }\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' nums :\u003D []int{2, 3, 4}\u000A sum :\u003D 0\u000A for _, num :\u003D range nums {\u000A sum +\u003D num\u000A }\u000A fmt.Println(\"sum:\", sum)\u000A');codeLines.push(' for i, num :\u003D range nums {\u000A if num \u003D\u003D 3 {\u000A fmt.Println(\"index:\", i)\u000A }\u000A }\u000A');codeLines.push(' kvs :\u003D map[string]string{\"a\": \"apple\", \"b\": \"banana\"}\u000A for k, v :\u003D range kvs {\u000A fmt.Printf(\"%s -\u003E %s\\n\", k, v)\u000A }\u000A');codeLines.push(' for k :\u003D range kvs {\u000A fmt.Println(\"key:\", k)\u000A }\u000A');codeLines.push(' for i, c :\u003D range \"go\" {\u000A fmt.Println(i, c)\u000A }\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/range-over-channels generated
View File

@ -154,7 +154,7 @@ values be received.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' queue :\x3D make(chan string, 2)\u000A queue \x3C- \"one\"\u000A queue \x3C- \"two\"\u000A close(queue)\u000A');codeLines.push(' for elem :\x3D range queue {\u000A fmt.Println(elem)\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' queue :\u003D make(chan string, 2)\u000A queue \u003C- \"one\"\u000A queue \u003C- \"two\"\u000A close(queue)\u000A');codeLines.push(' for elem :\u003D range queue {\u000A fmt.Println(elem)\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/rate-limiting generated
View File

@ -261,7 +261,7 @@ then serve the remaining 2 with ~200ms delays each.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' requests :\x3D make(chan int, 5)\u000A for i :\x3D 1; i \x3C\x3D 5; i++ {\u000A requests \x3C- i\u000A }\u000A close(requests)\u000A');codeLines.push(' limiter :\x3D time.Tick(200 * time.Millisecond)\u000A');codeLines.push(' for req :\x3D range requests {\u000A \x3C-limiter\u000A fmt.Println(\"request\", req, time.Now())\u000A }\u000A');codeLines.push(' burstyLimiter :\x3D make(chan time.Time, 3)\u000A');codeLines.push(' for i :\x3D 0; i \x3C 3; i++ {\u000A burstyLimiter \x3C- time.Now()\u000A }\u000A');codeLines.push(' go func() {\u000A for t :\x3D range time.Tick(200 * time.Millisecond) {\u000A burstyLimiter \x3C- t\u000A }\u000A }()\u000A');codeLines.push(' burstyRequests :\x3D make(chan int, 5)\u000A for i :\x3D 1; i \x3C\x3D 5; i++ {\u000A burstyRequests \x3C- i\u000A }\u000A close(burstyRequests)\u000A for req :\x3D range burstyRequests {\u000A \x3C-burstyLimiter\u000A fmt.Println(\"request\", req, time.Now())\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' requests :\u003D make(chan int, 5)\u000A for i :\u003D 1; i \u003C\u003D 5; i++ {\u000A requests \u003C- i\u000A }\u000A close(requests)\u000A');codeLines.push(' limiter :\u003D time.Tick(200 * time.Millisecond)\u000A');codeLines.push(' for req :\u003D range requests {\u000A \u003C-limiter\u000A fmt.Println(\"request\", req, time.Now())\u000A }\u000A');codeLines.push(' burstyLimiter :\u003D make(chan time.Time, 3)\u000A');codeLines.push(' for i :\u003D 0; i \u003C 3; i++ {\u000A burstyLimiter \u003C- time.Now()\u000A }\u000A');codeLines.push(' go func() {\u000A for t :\u003D range time.Tick(200 * time.Millisecond) {\u000A burstyLimiter \u003C- t\u000A }\u000A }()\u000A');codeLines.push(' burstyRequests :\u003D make(chan int, 5)\u000A for i :\u003D 1; i \u003C\u003D 5; i++ {\u000A burstyRequests \u003C- i\u000A }\u000A close(burstyRequests)\u000A for req :\u003D range burstyRequests {\u000A \u003C-burstyLimiter\u000A fmt.Println(\"request\", req, time.Now())\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/reading-files generated
View File

@ -287,7 +287,7 @@ be scheduled immediately after <code>Open</code>ing with
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"bufio\"\u000A \"fmt\"\u000A \"io\"\u000A \"io/ioutil\"\u000A \"os\"\u000A)\u000A');codeLines.push('func check(e error) {\u000A if e !\x3D nil {\u000A panic(e)\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' dat, err :\x3D ioutil.ReadFile(\"/tmp/dat\")\u000A check(err)\u000A fmt.Print(string(dat))\u000A');codeLines.push(' f, err :\x3D os.Open(\"/tmp/dat\")\u000A check(err)\u000A');codeLines.push(' b1 :\x3D make([]byte, 5)\u000A n1, err :\x3D f.Read(b1)\u000A check(err)\u000A fmt.Printf(\"%d bytes: %s\\n\", n1, string(b1[:n1]))\u000A');codeLines.push(' o2, err :\x3D f.Seek(6, 0)\u000A check(err)\u000A b2 :\x3D make([]byte, 2)\u000A n2, err :\x3D f.Read(b2)\u000A check(err)\u000A fmt.Printf(\"%d bytes @ %d: \", n2, o2)\u000A fmt.Printf(\"%v\\n\", string(b2[:n2]))\u000A');codeLines.push(' o3, err :\x3D f.Seek(6, 0)\u000A check(err)\u000A b3 :\x3D make([]byte, 2)\u000A n3, err :\x3D io.ReadAtLeast(f, b3, 2)\u000A check(err)\u000A fmt.Printf(\"%d bytes @ %d: %s\\n\", n3, o3, string(b3))\u000A');codeLines.push(' _, err \x3D f.Seek(0, 0)\u000A check(err)\u000A');codeLines.push(' r4 :\x3D bufio.NewReader(f)\u000A b4, err :\x3D r4.Peek(5)\u000A check(err)\u000A fmt.Printf(\"5 bytes: %s\\n\", string(b4))\u000A');codeLines.push(' f.Close()\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"bufio\"\u000A \"fmt\"\u000A \"io\"\u000A \"io/ioutil\"\u000A \"os\"\u000A)\u000A');codeLines.push('func check(e error) {\u000A if e !\u003D nil {\u000A panic(e)\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' dat, err :\u003D ioutil.ReadFile(\"/tmp/dat\")\u000A check(err)\u000A fmt.Print(string(dat))\u000A');codeLines.push(' f, err :\u003D os.Open(\"/tmp/dat\")\u000A check(err)\u000A');codeLines.push(' b1 :\u003D make([]byte, 5)\u000A n1, err :\u003D f.Read(b1)\u000A check(err)\u000A fmt.Printf(\"%d bytes: %s\\n\", n1, string(b1[:n1]))\u000A');codeLines.push(' o2, err :\u003D f.Seek(6, 0)\u000A check(err)\u000A b2 :\u003D make([]byte, 2)\u000A n2, err :\u003D f.Read(b2)\u000A check(err)\u000A fmt.Printf(\"%d bytes @ %d: \", n2, o2)\u000A fmt.Printf(\"%v\\n\", string(b2[:n2]))\u000A');codeLines.push(' o3, err :\u003D f.Seek(6, 0)\u000A check(err)\u000A b3 :\u003D make([]byte, 2)\u000A n3, err :\u003D io.ReadAtLeast(f, b3, 2)\u000A check(err)\u000A fmt.Printf(\"%d bytes @ %d: %s\\n\", n3, o3, string(b3))\u000A');codeLines.push(' _, err \u003D f.Seek(0, 0)\u000A check(err)\u000A');codeLines.push(' r4 :\u003D bufio.NewReader(f)\u000A b4, err :\u003D r4.Peek(5)\u000A check(err)\u000A fmt.Printf(\"5 bytes: %s\\n\", string(b4))\u000A');codeLines.push(' f.Close()\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/recursion generated
View File

@ -125,7 +125,7 @@ base case of <code>fact(0)</code>.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func fact(n int) int {\u000A if n \x3D\x3D 0 {\u000A return 1\u000A }\u000A return n * fact(n-1)\u000A}\u000A');codeLines.push('func main() {\u000A fmt.Println(fact(7))\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func fact(n int) int {\u000A if n \u003D\u003D 0 {\u000A return 1\u000A }\u000A return n * fact(n-1)\u000A}\u000A');codeLines.push('func main() {\u000A fmt.Println(fact(7))\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/regular-expressions generated
View File

@ -343,7 +343,7 @@ the <a href="http://golang.org/pkg/regexp/"><code>regexp</code></a> package docs
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"bytes\"\u000A \"fmt\"\u000A \"regexp\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' match, _ :\x3D regexp.MatchString(\"p([a-z]+)ch\", \"peach\")\u000A fmt.Println(match)\u000A');codeLines.push(' r, _ :\x3D regexp.Compile(\"p([a-z]+)ch\")\u000A');codeLines.push(' fmt.Println(r.MatchString(\"peach\"))\u000A');codeLines.push(' fmt.Println(r.FindString(\"peach punch\"))\u000A');codeLines.push(' fmt.Println(r.FindStringIndex(\"peach punch\"))\u000A');codeLines.push(' fmt.Println(r.FindStringSubmatch(\"peach punch\"))\u000A');codeLines.push(' fmt.Println(r.FindStringSubmatchIndex(\"peach punch\"))\u000A');codeLines.push(' fmt.Println(r.FindAllString(\"peach punch pinch\", -1))\u000A');codeLines.push(' fmt.Println(r.FindAllStringSubmatchIndex(\u000A \"peach punch pinch\", -1))\u000A');codeLines.push(' fmt.Println(r.FindAllString(\"peach punch pinch\", 2))\u000A');codeLines.push(' fmt.Println(r.Match([]byte(\"peach\")))\u000A');codeLines.push(' r \x3D regexp.MustCompile(\"p([a-z]+)ch\")\u000A fmt.Println(r)\u000A');codeLines.push(' fmt.Println(r.ReplaceAllString(\"a peach\", \"\x3Cfruit\x3E\"))\u000A');codeLines.push(' in :\x3D []byte(\"a peach\")\u000A out :\x3D r.ReplaceAllFunc(in, bytes.ToUpper)\u000A fmt.Println(string(out))\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"bytes\"\u000A \"fmt\"\u000A \"regexp\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' match, _ :\u003D regexp.MatchString(\"p([a-z]+)ch\", \"peach\")\u000A fmt.Println(match)\u000A');codeLines.push(' r, _ :\u003D regexp.Compile(\"p([a-z]+)ch\")\u000A');codeLines.push(' fmt.Println(r.MatchString(\"peach\"))\u000A');codeLines.push(' fmt.Println(r.FindString(\"peach punch\"))\u000A');codeLines.push(' fmt.Println(r.FindStringIndex(\"peach punch\"))\u000A');codeLines.push(' fmt.Println(r.FindStringSubmatch(\"peach punch\"))\u000A');codeLines.push(' fmt.Println(r.FindStringSubmatchIndex(\"peach punch\"))\u000A');codeLines.push(' fmt.Println(r.FindAllString(\"peach punch pinch\", -1))\u000A');codeLines.push(' fmt.Println(r.FindAllStringSubmatchIndex(\u000A \"peach punch pinch\", -1))\u000A');codeLines.push(' fmt.Println(r.FindAllString(\"peach punch pinch\", 2))\u000A');codeLines.push(' fmt.Println(r.Match([]byte(\"peach\")))\u000A');codeLines.push(' r \u003D regexp.MustCompile(\"p([a-z]+)ch\")\u000A fmt.Println(r)\u000A');codeLines.push(' fmt.Println(r.ReplaceAllString(\"a peach\", \"\u003Cfruit\u003E\"))\u000A');codeLines.push(' in :\u003D []byte(\"a peach\")\u000A out :\u003D r.ReplaceAllFunc(in, bytes.ToUpper)\u000A fmt.Println(string(out))\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/select generated
View File

@ -183,7 +183,7 @@ concurrently.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' c1 :\x3D make(chan string)\u000A c2 :\x3D make(chan string)\u000A');codeLines.push(' go func() {\u000A time.Sleep(1 * time.Second)\u000A c1 \x3C- \"one\"\u000A }()\u000A go func() {\u000A time.Sleep(2 * time.Second)\u000A c2 \x3C- \"two\"\u000A }()\u000A');codeLines.push(' for i :\x3D 0; i \x3C 2; i++ {\u000A select {\u000A case msg1 :\x3D \x3C-c1:\u000A fmt.Println(\"received\", msg1)\u000A case msg2 :\x3D \x3C-c2:\u000A fmt.Println(\"received\", msg2)\u000A }\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' c1 :\u003D make(chan string)\u000A c2 :\u003D make(chan string)\u000A');codeLines.push(' go func() {\u000A time.Sleep(1 * time.Second)\u000A c1 \u003C- \"one\"\u000A }()\u000A go func() {\u000A time.Sleep(2 * time.Second)\u000A c2 \u003C- \"two\"\u000A }()\u000A');codeLines.push(' for i :\u003D 0; i \u003C 2; i++ {\u000A select {\u000A case msg1 :\u003D \u003C-c1:\u000A fmt.Println(\"received\", msg1)\u000A case msg2 :\u003D \u003C-c2:\u000A fmt.Println(\"received\", msg2)\u000A }\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/sha1-hashes generated
View File

@ -203,7 +203,7 @@ you should carefully research
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"crypto/sha1\"\u000A \"fmt\"\u000A)\u000A');codeLines.push('func main() {\u000A s :\x3D \"sha1 this string\"\u000A');codeLines.push(' h :\x3D sha1.New()\u000A');codeLines.push(' h.Write([]byte(s))\u000A');codeLines.push(' bs :\x3D h.Sum(nil)\u000A');codeLines.push(' fmt.Println(s)\u000A fmt.Printf(\"%x\\n\", bs)\u000A}\u000A');codeLines.push('');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"crypto/sha1\"\u000A \"fmt\"\u000A)\u000A');codeLines.push('func main() {\u000A s :\u003D \"sha1 this string\"\u000A');codeLines.push(' h :\u003D sha1.New()\u000A');codeLines.push(' h.Write([]byte(s))\u000A');codeLines.push(' bs :\u003D h.Sum(nil)\u000A');codeLines.push(' fmt.Println(s)\u000A fmt.Printf(\"%x\\n\", bs)\u000A}\u000A');codeLines.push('');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/signals generated
View File

@ -188,7 +188,7 @@ causing the program to print <code>interrupt</code> and then exit.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"os\"\u000A \"os/signal\"\u000A \"syscall\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' sigs :\x3D make(chan os.Signal, 1)\u000A done :\x3D make(chan bool, 1)\u000A');codeLines.push(' signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)\u000A');codeLines.push(' go func() {\u000A sig :\x3D \x3C-sigs\u000A fmt.Println()\u000A fmt.Println(sig)\u000A done \x3C- true\u000A }()\u000A');codeLines.push(' fmt.Println(\"awaiting signal\")\u000A \x3C-done\u000A fmt.Println(\"exiting\")\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"os\"\u000A \"os/signal\"\u000A \"syscall\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' sigs :\u003D make(chan os.Signal, 1)\u000A done :\u003D make(chan bool, 1)\u000A');codeLines.push(' signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)\u000A');codeLines.push(' go func() {\u000A sig :\u003D \u003C-sigs\u000A fmt.Println()\u000A fmt.Println(sig)\u000A done \u003C- true\u000A }()\u000A');codeLines.push(' fmt.Println(\"awaiting signal\")\u000A \u003C-done\u000A fmt.Println(\"exiting\")\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/slices generated
View File

@ -308,7 +308,7 @@ Go&rsquo;s other key builtin data structure: maps.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' s :\x3D make([]string, 3)\u000A fmt.Println(\"emp:\", s)\u000A');codeLines.push(' s[0] \x3D \"a\"\u000A s[1] \x3D \"b\"\u000A s[2] \x3D \"c\"\u000A fmt.Println(\"set:\", s)\u000A fmt.Println(\"get:\", s[2])\u000A');codeLines.push(' fmt.Println(\"len:\", len(s))\u000A');codeLines.push(' s \x3D append(s, \"d\")\u000A s \x3D append(s, \"e\", \"f\")\u000A fmt.Println(\"apd:\", s)\u000A');codeLines.push(' c :\x3D make([]string, len(s))\u000A copy(c, s)\u000A fmt.Println(\"cpy:\", c)\u000A');codeLines.push(' l :\x3D s[2:5]\u000A fmt.Println(\"sl1:\", l)\u000A');codeLines.push(' l \x3D s[:5]\u000A fmt.Println(\"sl2:\", l)\u000A');codeLines.push(' l \x3D s[2:]\u000A fmt.Println(\"sl3:\", l)\u000A');codeLines.push(' t :\x3D []string{\"g\", \"h\", \"i\"}\u000A fmt.Println(\"dcl:\", t)\u000A');codeLines.push(' twoD :\x3D make([][]int, 3)\u000A for i :\x3D 0; i \x3C 3; i++ {\u000A innerLen :\x3D i + 1\u000A twoD[i] \x3D make([]int, innerLen)\u000A for j :\x3D 0; j \x3C innerLen; j++ {\u000A twoD[i][j] \x3D i + j\u000A }\u000A }\u000A fmt.Println(\"2d: \", twoD)\u000A}\u000A');codeLines.push('');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' s :\u003D make([]string, 3)\u000A fmt.Println(\"emp:\", s)\u000A');codeLines.push(' s[0] \u003D \"a\"\u000A s[1] \u003D \"b\"\u000A s[2] \u003D \"c\"\u000A fmt.Println(\"set:\", s)\u000A fmt.Println(\"get:\", s[2])\u000A');codeLines.push(' fmt.Println(\"len:\", len(s))\u000A');codeLines.push(' s \u003D append(s, \"d\")\u000A s \u003D append(s, \"e\", \"f\")\u000A fmt.Println(\"apd:\", s)\u000A');codeLines.push(' c :\u003D make([]string, len(s))\u000A copy(c, s)\u000A fmt.Println(\"cpy:\", c)\u000A');codeLines.push(' l :\u003D s[2:5]\u000A fmt.Println(\"sl1:\", l)\u000A');codeLines.push(' l \u003D s[:5]\u000A fmt.Println(\"sl2:\", l)\u000A');codeLines.push(' l \u003D s[2:]\u000A fmt.Println(\"sl3:\", l)\u000A');codeLines.push(' t :\u003D []string{\"g\", \"h\", \"i\"}\u000A fmt.Println(\"dcl:\", t)\u000A');codeLines.push(' twoD :\u003D make([][]int, 3)\u000A for i :\u003D 0; i \u003C 3; i++ {\u000A innerLen :\u003D i + 1\u000A twoD[i] \u003D make([]int, innerLen)\u000A for j :\u003D 0; j \u003C innerLen; j++ {\u000A twoD[i][j] \u003D i + j\u000A }\u000A }\u000A fmt.Println(\"2d: \", twoD)\u000A}\u000A');codeLines.push('');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/sorting generated
View File

@ -160,7 +160,7 @@ slices and <code>true</code> as the result of our <code>AreSorted</code> test.</
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"sort\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' strs :\x3D []string{\"c\", \"a\", \"b\"}\u000A sort.Strings(strs)\u000A fmt.Println(\"Strings:\", strs)\u000A');codeLines.push(' ints :\x3D []int{7, 2, 4}\u000A sort.Ints(ints)\u000A fmt.Println(\"Ints: \", ints)\u000A');codeLines.push(' s :\x3D sort.IntsAreSorted(ints)\u000A fmt.Println(\"Sorted: \", s)\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"sort\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' strs :\u003D []string{\"c\", \"a\", \"b\"}\u000A sort.Strings(strs)\u000A fmt.Println(\"Strings:\", strs)\u000A');codeLines.push(' ints :\u003D []int{7, 2, 4}\u000A sort.Ints(ints)\u000A fmt.Println(\"Ints: \", ints)\u000A');codeLines.push(' s :\u003D sort.IntsAreSorted(ints)\u000A fmt.Println(\"Sorted: \", s)\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/sorting-by-functions generated
View File

@ -177,7 +177,7 @@ functions.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"sort\"\u000A)\u000A');codeLines.push('type byLength []string\u000A');codeLines.push('func (s byLength) Len() int {\u000A return len(s)\u000A}\u000Afunc (s byLength) Swap(i, j int) {\u000A s[i], s[j] \x3D s[j], s[i]\u000A}\u000Afunc (s byLength) Less(i, j int) bool {\u000A return len(s[i]) \x3C len(s[j])\u000A}\u000A');codeLines.push('func main() {\u000A fruits :\x3D []string{\"peach\", \"banana\", \"kiwi\"}\u000A sort.Sort(byLength(fruits))\u000A fmt.Println(fruits)\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"sort\"\u000A)\u000A');codeLines.push('type byLength []string\u000A');codeLines.push('func (s byLength) Len() int {\u000A return len(s)\u000A}\u000Afunc (s byLength) Swap(i, j int) {\u000A s[i], s[j] \u003D s[j], s[i]\u000A}\u000Afunc (s byLength) Less(i, j int) bool {\u000A return len(s[i]) \u003C len(s[j])\u000A}\u000A');codeLines.push('func main() {\u000A fruits :\u003D []string{\"peach\", \"banana\", \"kiwi\"}\u000A sort.Sort(byLength(fruits))\u000A fmt.Println(fruits)\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/spawning-processes generated
View File

@ -259,7 +259,7 @@ as if we had run them directly from the command-line.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"io/ioutil\"\u000A \"os/exec\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' dateCmd :\x3D exec.Command(\"date\")\u000A');codeLines.push(' dateOut, err :\x3D dateCmd.Output()\u000A if err !\x3D nil {\u000A panic(err)\u000A }\u000A fmt.Println(\"\x3E date\")\u000A fmt.Println(string(dateOut))\u000A');codeLines.push(' grepCmd :\x3D exec.Command(\"grep\", \"hello\")\u000A');codeLines.push(' grepIn, _ :\x3D grepCmd.StdinPipe()\u000A grepOut, _ :\x3D grepCmd.StdoutPipe()\u000A grepCmd.Start()\u000A grepIn.Write([]byte(\"hello grep\\ngoodbye grep\"))\u000A grepIn.Close()\u000A grepBytes, _ :\x3D ioutil.ReadAll(grepOut)\u000A grepCmd.Wait()\u000A');codeLines.push(' fmt.Println(\"\x3E grep hello\")\u000A fmt.Println(string(grepBytes))\u000A');codeLines.push(' lsCmd :\x3D exec.Command(\"bash\", \"-c\", \"ls -a -l -h\")\u000A lsOut, err :\x3D lsCmd.Output()\u000A if err !\x3D nil {\u000A panic(err)\u000A }\u000A fmt.Println(\"\x3E ls -a -l -h\")\u000A fmt.Println(string(lsOut))\u000A}\u000A');codeLines.push('');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"io/ioutil\"\u000A \"os/exec\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' dateCmd :\u003D exec.Command(\"date\")\u000A');codeLines.push(' dateOut, err :\u003D dateCmd.Output()\u000A if err !\u003D nil {\u000A panic(err)\u000A }\u000A fmt.Println(\"\u003E date\")\u000A fmt.Println(string(dateOut))\u000A');codeLines.push(' grepCmd :\u003D exec.Command(\"grep\", \"hello\")\u000A');codeLines.push(' grepIn, _ :\u003D grepCmd.StdinPipe()\u000A grepOut, _ :\u003D grepCmd.StdoutPipe()\u000A grepCmd.Start()\u000A grepIn.Write([]byte(\"hello grep\\ngoodbye grep\"))\u000A grepIn.Close()\u000A grepBytes, _ :\u003D ioutil.ReadAll(grepOut)\u000A grepCmd.Wait()\u000A');codeLines.push(' fmt.Println(\"\u003E grep hello\")\u000A fmt.Println(string(grepBytes))\u000A');codeLines.push(' lsCmd :\u003D exec.Command(\"bash\", \"-c\", \"ls -a -l -h\")\u000A lsOut, err :\u003D lsCmd.Output()\u000A if err !\u003D nil {\u000A panic(err)\u000A }\u000A fmt.Println(\"\u003E ls -a -l -h\")\u000A fmt.Println(string(lsOut))\u000A}\u000A');codeLines.push('');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/stateful-goroutines generated
View File

@ -312,7 +312,7 @@ program.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"math/rand\"\u000A \"sync/atomic\"\u000A \"time\"\u000A)\u000A');codeLines.push('type readOp struct {\u000A key int\u000A resp chan int\u000A}\u000Atype writeOp struct {\u000A key int\u000A val int\u000A resp chan bool\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' var readOps uint64\u000A var writeOps uint64\u000A');codeLines.push(' reads :\x3D make(chan readOp)\u000A writes :\x3D make(chan writeOp)\u000A');codeLines.push(' go func() {\u000A var state \x3D make(map[int]int)\u000A for {\u000A select {\u000A case read :\x3D \x3C-reads:\u000A read.resp \x3C- state[read.key]\u000A case write :\x3D \x3C-writes:\u000A state[write.key] \x3D write.val\u000A write.resp \x3C- true\u000A }\u000A }\u000A }()\u000A');codeLines.push(' for r :\x3D 0; r \x3C 100; r++ {\u000A go func() {\u000A for {\u000A read :\x3D readOp{\u000A key: rand.Intn(5),\u000A resp: make(chan int)}\u000A reads \x3C- read\u000A \x3C-read.resp\u000A atomic.AddUint64(\x26readOps, 1)\u000A time.Sleep(time.Millisecond)\u000A }\u000A }()\u000A }\u000A');codeLines.push(' for w :\x3D 0; w \x3C 10; w++ {\u000A go func() {\u000A for {\u000A write :\x3D writeOp{\u000A key: rand.Intn(5),\u000A val: rand.Intn(100),\u000A resp: make(chan bool)}\u000A writes \x3C- write\u000A \x3C-write.resp\u000A atomic.AddUint64(\x26writeOps, 1)\u000A time.Sleep(time.Millisecond)\u000A }\u000A }()\u000A }\u000A');codeLines.push(' time.Sleep(time.Second)\u000A');codeLines.push(' readOpsFinal :\x3D atomic.LoadUint64(\x26readOps)\u000A fmt.Println(\"readOps:\", readOpsFinal)\u000A writeOpsFinal :\x3D atomic.LoadUint64(\x26writeOps)\u000A fmt.Println(\"writeOps:\", writeOpsFinal)\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"math/rand\"\u000A \"sync/atomic\"\u000A \"time\"\u000A)\u000A');codeLines.push('type readOp struct {\u000A key int\u000A resp chan int\u000A}\u000Atype writeOp struct {\u000A key int\u000A val int\u000A resp chan bool\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' var readOps uint64\u000A var writeOps uint64\u000A');codeLines.push(' reads :\u003D make(chan readOp)\u000A writes :\u003D make(chan writeOp)\u000A');codeLines.push(' go func() {\u000A var state \u003D make(map[int]int)\u000A for {\u000A select {\u000A case read :\u003D \u003C-reads:\u000A read.resp \u003C- state[read.key]\u000A case write :\u003D \u003C-writes:\u000A state[write.key] \u003D write.val\u000A write.resp \u003C- true\u000A }\u000A }\u000A }()\u000A');codeLines.push(' for r :\u003D 0; r \u003C 100; r++ {\u000A go func() {\u000A for {\u000A read :\u003D readOp{\u000A key: rand.Intn(5),\u000A resp: make(chan int)}\u000A reads \u003C- read\u000A \u003C-read.resp\u000A atomic.AddUint64(\u0026readOps, 1)\u000A time.Sleep(time.Millisecond)\u000A }\u000A }()\u000A }\u000A');codeLines.push(' for w :\u003D 0; w \u003C 10; w++ {\u000A go func() {\u000A for {\u000A write :\u003D writeOp{\u000A key: rand.Intn(5),\u000A val: rand.Intn(100),\u000A resp: make(chan bool)}\u000A writes \u003C- write\u000A \u003C-write.resp\u000A atomic.AddUint64(\u0026writeOps, 1)\u000A time.Sleep(time.Millisecond)\u000A }\u000A }()\u000A }\u000A');codeLines.push(' time.Sleep(time.Second)\u000A');codeLines.push(' readOpsFinal :\u003D atomic.LoadUint64(\u0026readOps)\u000A fmt.Println(\"readOps:\", readOpsFinal)\u000A writeOpsFinal :\u003D atomic.LoadUint64(\u0026writeOps)\u000A fmt.Println(\"writeOps:\", writeOpsFinal)\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/string-formatting generated
View File

@ -457,7 +457,7 @@ and returns a string without printing it anywhere.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"os\"\u000A)\u000A');codeLines.push('type point struct {\u000A x, y int\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' p :\x3D point{1, 2}\u000A fmt.Printf(\"%v\\n\", p)\u000A');codeLines.push(' fmt.Printf(\"%+v\\n\", p)\u000A');codeLines.push(' fmt.Printf(\"%#v\\n\", p)\u000A');codeLines.push(' fmt.Printf(\"%T\\n\", p)\u000A');codeLines.push(' fmt.Printf(\"%t\\n\", true)\u000A');codeLines.push(' fmt.Printf(\"%d\\n\", 123)\u000A');codeLines.push(' fmt.Printf(\"%b\\n\", 14)\u000A');codeLines.push(' fmt.Printf(\"%c\\n\", 33)\u000A');codeLines.push(' fmt.Printf(\"%x\\n\", 456)\u000A');codeLines.push(' fmt.Printf(\"%f\\n\", 78.9)\u000A');codeLines.push(' fmt.Printf(\"%e\\n\", 123400000.0)\u000A fmt.Printf(\"%E\\n\", 123400000.0)\u000A');codeLines.push(' fmt.Printf(\"%s\\n\", \"\\\"string\\\"\")\u000A');codeLines.push(' fmt.Printf(\"%q\\n\", \"\\\"string\\\"\")\u000A');codeLines.push(' fmt.Printf(\"%x\\n\", \"hex this\")\u000A');codeLines.push(' fmt.Printf(\"%p\\n\", \x26p)\u000A');codeLines.push(' fmt.Printf(\"|%6d|%6d|\\n\", 12, 345)\u000A');codeLines.push(' fmt.Printf(\"|%6.2f|%6.2f|\\n\", 1.2, 3.45)\u000A');codeLines.push(' fmt.Printf(\"|%-6.2f|%-6.2f|\\n\", 1.2, 3.45)\u000A');codeLines.push(' fmt.Printf(\"|%6s|%6s|\\n\", \"foo\", \"b\")\u000A');codeLines.push(' fmt.Printf(\"|%-6s|%-6s|\\n\", \"foo\", \"b\")\u000A');codeLines.push(' s :\x3D fmt.Sprintf(\"a %s\", \"string\")\u000A fmt.Println(s)\u000A');codeLines.push(' fmt.Fprintf(os.Stderr, \"an %s\\n\", \"error\")\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"os\"\u000A)\u000A');codeLines.push('type point struct {\u000A x, y int\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' p :\u003D point{1, 2}\u000A fmt.Printf(\"%v\\n\", p)\u000A');codeLines.push(' fmt.Printf(\"%+v\\n\", p)\u000A');codeLines.push(' fmt.Printf(\"%#v\\n\", p)\u000A');codeLines.push(' fmt.Printf(\"%T\\n\", p)\u000A');codeLines.push(' fmt.Printf(\"%t\\n\", true)\u000A');codeLines.push(' fmt.Printf(\"%d\\n\", 123)\u000A');codeLines.push(' fmt.Printf(\"%b\\n\", 14)\u000A');codeLines.push(' fmt.Printf(\"%c\\n\", 33)\u000A');codeLines.push(' fmt.Printf(\"%x\\n\", 456)\u000A');codeLines.push(' fmt.Printf(\"%f\\n\", 78.9)\u000A');codeLines.push(' fmt.Printf(\"%e\\n\", 123400000.0)\u000A fmt.Printf(\"%E\\n\", 123400000.0)\u000A');codeLines.push(' fmt.Printf(\"%s\\n\", \"\\\"string\\\"\")\u000A');codeLines.push(' fmt.Printf(\"%q\\n\", \"\\\"string\\\"\")\u000A');codeLines.push(' fmt.Printf(\"%x\\n\", \"hex this\")\u000A');codeLines.push(' fmt.Printf(\"%p\\n\", \u0026p)\u000A');codeLines.push(' fmt.Printf(\"|%6d|%6d|\\n\", 12, 345)\u000A');codeLines.push(' fmt.Printf(\"|%6.2f|%6.2f|\\n\", 1.2, 3.45)\u000A');codeLines.push(' fmt.Printf(\"|%-6.2f|%-6.2f|\\n\", 1.2, 3.45)\u000A');codeLines.push(' fmt.Printf(\"|%6s|%6s|\\n\", \"foo\", \"b\")\u000A');codeLines.push(' fmt.Printf(\"|%-6s|%-6s|\\n\", \"foo\", \"b\")\u000A');codeLines.push(' s :\u003D fmt.Sprintf(\"a %s\", \"string\")\u000A fmt.Println(s)\u000A');codeLines.push(' fmt.Fprintf(os.Stderr, \"an %s\\n\", \"error\")\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/string-functions generated
View File

@ -209,7 +209,7 @@ for more information.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A s \"strings\"\u000A)\u000A');codeLines.push('var p \x3D fmt.Println\u000A');codeLines.push('func main() {\u000A');codeLines.push(' p(\"Contains: \", s.Contains(\"test\", \"es\"))\u000A p(\"Count: \", s.Count(\"test\", \"t\"))\u000A p(\"HasPrefix: \", s.HasPrefix(\"test\", \"te\"))\u000A p(\"HasSuffix: \", s.HasSuffix(\"test\", \"st\"))\u000A p(\"Index: \", s.Index(\"test\", \"e\"))\u000A p(\"Join: \", s.Join([]string{\"a\", \"b\"}, \"-\"))\u000A p(\"Repeat: \", s.Repeat(\"a\", 5))\u000A p(\"Replace: \", s.Replace(\"foo\", \"o\", \"0\", -1))\u000A p(\"Replace: \", s.Replace(\"foo\", \"o\", \"0\", 1))\u000A p(\"Split: \", s.Split(\"a-b-c-d-e\", \"-\"))\u000A p(\"ToLower: \", s.ToLower(\"TEST\"))\u000A p(\"ToUpper: \", s.ToUpper(\"test\"))\u000A p()\u000A');codeLines.push(' p(\"Len: \", len(\"hello\"))\u000A p(\"Char:\", \"hello\"[1])\u000A}\u000A');codeLines.push('');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A s \"strings\"\u000A)\u000A');codeLines.push('var p \u003D fmt.Println\u000A');codeLines.push('func main() {\u000A');codeLines.push(' p(\"Contains: \", s.Contains(\"test\", \"es\"))\u000A p(\"Count: \", s.Count(\"test\", \"t\"))\u000A p(\"HasPrefix: \", s.HasPrefix(\"test\", \"te\"))\u000A p(\"HasSuffix: \", s.HasSuffix(\"test\", \"st\"))\u000A p(\"Index: \", s.Index(\"test\", \"e\"))\u000A p(\"Join: \", s.Join([]string{\"a\", \"b\"}, \"-\"))\u000A p(\"Repeat: \", s.Repeat(\"a\", 5))\u000A p(\"Replace: \", s.Replace(\"foo\", \"o\", \"0\", -1))\u000A p(\"Replace: \", s.Replace(\"foo\", \"o\", \"0\", 1))\u000A p(\"Split: \", s.Split(\"a-b-c-d-e\", \"-\"))\u000A p(\"ToLower: \", s.ToLower(\"TEST\"))\u000A p(\"ToUpper: \", s.ToUpper(\"test\"))\u000A p()\u000A');codeLines.push(' p(\"Len: \", len(\"hello\"))\u000A p(\"Char:\", \"hello\"[1])\u000A}\u000A');codeLines.push('');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/structs generated
View File

@ -266,7 +266,7 @@ pointers are automatically dereferenced.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('type person struct {\u000A name string\u000A age int\u000A}\u000A');codeLines.push('func newPerson(name string) *person {\u000A');codeLines.push(' p :\x3D person{name: name}\u000A p.age \x3D 42\u000A return \x26p\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' fmt.Println(person{\"Bob\", 20})\u000A');codeLines.push(' fmt.Println(person{name: \"Alice\", age: 30})\u000A');codeLines.push(' fmt.Println(person{name: \"Fred\"})\u000A');codeLines.push(' fmt.Println(\x26person{name: \"Ann\", age: 40})\u000A');codeLines.push(' fmt.Println(newPerson(\"Jon\"))\u000A');codeLines.push(' s :\x3D person{name: \"Sean\", age: 50}\u000A fmt.Println(s.name)\u000A');codeLines.push(' sp :\x3D \x26s\u000A fmt.Println(sp.age)\u000A');codeLines.push(' sp.age \x3D 51\u000A fmt.Println(sp.age)\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('type person struct {\u000A name string\u000A age int\u000A}\u000A');codeLines.push('func newPerson(name string) *person {\u000A');codeLines.push(' p :\u003D person{name: name}\u000A p.age \u003D 42\u000A return \u0026p\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' fmt.Println(person{\"Bob\", 20})\u000A');codeLines.push(' fmt.Println(person{name: \"Alice\", age: 30})\u000A');codeLines.push(' fmt.Println(person{name: \"Fred\"})\u000A');codeLines.push(' fmt.Println(\u0026person{name: \"Ann\", age: 40})\u000A');codeLines.push(' fmt.Println(newPerson(\"Jon\"))\u000A');codeLines.push(' s :\u003D person{name: \"Sean\", age: 50}\u000A fmt.Println(s.name)\u000A');codeLines.push(' sp :\u003D \u0026s\u000A fmt.Println(sp.age)\u000A');codeLines.push(' sp.age \u003D 51\u000A fmt.Println(sp.age)\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/switch generated
View File

@ -203,7 +203,7 @@ type corresponding to its clause.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' i :\x3D 2\u000A fmt.Print(\"Write \", i, \" as \")\u000A switch i {\u000A case 1:\u000A fmt.Println(\"one\")\u000A case 2:\u000A fmt.Println(\"two\")\u000A case 3:\u000A fmt.Println(\"three\")\u000A }\u000A');codeLines.push(' switch time.Now().Weekday() {\u000A case time.Saturday, time.Sunday:\u000A fmt.Println(\"It\'s the weekend\")\u000A default:\u000A fmt.Println(\"It\'s a weekday\")\u000A }\u000A');codeLines.push(' t :\x3D time.Now()\u000A switch {\u000A case t.Hour() \x3C 12:\u000A fmt.Println(\"It\'s before noon\")\u000A default:\u000A fmt.Println(\"It\'s after noon\")\u000A }\u000A');codeLines.push(' whatAmI :\x3D func(i interface{}) {\u000A switch t :\x3D i.(type) {\u000A case bool:\u000A fmt.Println(\"I\'m a bool\")\u000A case int:\u000A fmt.Println(\"I\'m an int\")\u000A default:\u000A fmt.Printf(\"Don\'t know type %T\\n\", t)\u000A }\u000A }\u000A whatAmI(true)\u000A whatAmI(1)\u000A whatAmI(\"hey\")\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' i :\u003D 2\u000A fmt.Print(\"Write \", i, \" as \")\u000A switch i {\u000A case 1:\u000A fmt.Println(\"one\")\u000A case 2:\u000A fmt.Println(\"two\")\u000A case 3:\u000A fmt.Println(\"three\")\u000A }\u000A');codeLines.push(' switch time.Now().Weekday() {\u000A case time.Saturday, time.Sunday:\u000A fmt.Println(\"It\'s the weekend\")\u000A default:\u000A fmt.Println(\"It\'s a weekday\")\u000A }\u000A');codeLines.push(' t :\u003D time.Now()\u000A switch {\u000A case t.Hour() \u003C 12:\u000A fmt.Println(\"It\'s before noon\")\u000A default:\u000A fmt.Println(\"It\'s after noon\")\u000A }\u000A');codeLines.push(' whatAmI :\u003D func(i interface{}) {\u000A switch t :\u003D i.(type) {\u000A case bool:\u000A fmt.Println(\"I\'m a bool\")\u000A case int:\u000A fmt.Println(\"I\'m an int\")\u000A default:\u000A fmt.Printf(\"Don\'t know type %T\\n\", t)\u000A }\u000A }\u000A whatAmI(true)\u000A whatAmI(1)\u000A whatAmI(\"hey\")\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/temporary-files-and-directories generated
View File

@ -242,7 +242,7 @@ prefixing them with our temporary directory.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"io/ioutil\"\u000A \"os\"\u000A \"path/filepath\"\u000A)\u000A');codeLines.push('func check(e error) {\u000A if e !\x3D nil {\u000A panic(e)\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' f, err :\x3D ioutil.TempFile(\"\", \"sample\")\u000A check(err)\u000A');codeLines.push(' fmt.Println(\"Temp file name:\", f.Name())\u000A');codeLines.push(' defer os.Remove(f.Name())\u000A');codeLines.push(' _, err \x3D f.Write([]byte{1, 2, 3, 4})\u000A check(err)\u000A');codeLines.push(' dname, err :\x3D ioutil.TempDir(\"\", \"sampledir\")\u000A check(err)\u000A fmt.Println(\"Temp dir name:\", dname)\u000A');codeLines.push(' defer os.RemoveAll(dname)\u000A');codeLines.push(' fname :\x3D filepath.Join(dname, \"file1\")\u000A err \x3D ioutil.WriteFile(fname, []byte{1, 2}, 0666)\u000A check(err)\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"io/ioutil\"\u000A \"os\"\u000A \"path/filepath\"\u000A)\u000A');codeLines.push('func check(e error) {\u000A if e !\u003D nil {\u000A panic(e)\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' f, err :\u003D ioutil.TempFile(\"\", \"sample\")\u000A check(err)\u000A');codeLines.push(' fmt.Println(\"Temp file name:\", f.Name())\u000A');codeLines.push(' defer os.Remove(f.Name())\u000A');codeLines.push(' _, err \u003D f.Write([]byte{1, 2, 3, 4})\u000A check(err)\u000A');codeLines.push(' dname, err :\u003D ioutil.TempDir(\"\", \"sampledir\")\u000A check(err)\u000A fmt.Println(\"Temp dir name:\", dname)\u000A');codeLines.push(' defer os.RemoveAll(dname)\u000A');codeLines.push(' fname :\u003D filepath.Join(dname, \"file1\")\u000A err \u003D ioutil.WriteFile(fname, []byte{1, 2}, 0666)\u000A check(err)\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/testing generated
View File

@ -231,7 +231,7 @@ when executing <code>go test -v</code>.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"testing\"\u000A)\u000A');codeLines.push('func IntMin(a, b int) int {\u000A if a \x3C b {\u000A return a\u000A }\u000A return b\u000A}\u000A');codeLines.push('func TestIntMinBasic(t *testing.T) {\u000A ans :\x3D IntMin(2, -2)\u000A if ans !\x3D -2 {\u000A');codeLines.push(' t.Errorf(\"IntMin(2, -2) \x3D %d; want -2\", ans)\u000A }\u000A}\u000A');codeLines.push('func TestIntMinTableDriven(t *testing.T) {\u000A var tests \x3D []struct {\u000A a, b int\u000A want int\u000A }{\u000A {0, 1, 0},\u000A {1, 0, 0},\u000A {2, -2, -2},\u000A {0, -1, -1},\u000A {-1, 0, -1},\u000A }\u000A');codeLines.push(' for _, tt :\x3D range tests {\u000A');codeLines.push(' testname :\x3D fmt.Sprintf(\"%d,%d\", tt.a, tt.b)\u000A t.Run(testname, func(t *testing.T) {\u000A ans :\x3D IntMin(tt.a, tt.b)\u000A if ans !\x3D tt.want {\u000A t.Errorf(\"got %d, want %d\", ans, tt.want)\u000A }\u000A })\u000A }\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"testing\"\u000A)\u000A');codeLines.push('func IntMin(a, b int) int {\u000A if a \u003C b {\u000A return a\u000A }\u000A return b\u000A}\u000A');codeLines.push('func TestIntMinBasic(t *testing.T) {\u000A ans :\u003D IntMin(2, -2)\u000A if ans !\u003D -2 {\u000A');codeLines.push(' t.Errorf(\"IntMin(2, -2) \u003D %d; want -2\", ans)\u000A }\u000A}\u000A');codeLines.push('func TestIntMinTableDriven(t *testing.T) {\u000A var tests \u003D []struct {\u000A a, b int\u000A want int\u000A }{\u000A {0, 1, 0},\u000A {1, 0, 0},\u000A {2, -2, -2},\u000A {0, -1, -1},\u000A {-1, 0, -1},\u000A }\u000A');codeLines.push(' for _, tt :\u003D range tests {\u000A');codeLines.push(' testname :\u003D fmt.Sprintf(\"%d,%d\", tt.a, tt.b)\u000A t.Run(testname, func(t *testing.T) {\u000A ans :\u003D IntMin(tt.a, tt.b)\u000A if ans !\u003D tt.want {\u000A t.Errorf(\"got %d, want %d\", ans, tt.want)\u000A }\u000A })\u000A }\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/tickers generated
View File

@ -171,7 +171,7 @@ before we stop it.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' ticker :\x3D time.NewTicker(500 * time.Millisecond)\u000A done :\x3D make(chan bool)\u000A');codeLines.push(' go func() {\u000A for {\u000A select {\u000A case \x3C-done:\u000A return\u000A case t :\x3D \x3C-ticker.C:\u000A fmt.Println(\"Tick at\", t)\u000A }\u000A }\u000A }()\u000A');codeLines.push(' time.Sleep(1600 * time.Millisecond)\u000A ticker.Stop()\u000A done \x3C- true\u000A fmt.Println(\"Ticker stopped\")\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' ticker :\u003D time.NewTicker(500 * time.Millisecond)\u000A done :\u003D make(chan bool)\u000A');codeLines.push(' go func() {\u000A for {\u000A select {\u000A case \u003C-done:\u000A return\u000A case t :\u003D \u003C-ticker.C:\u000A fmt.Println(\"Tick at\", t)\u000A }\u000A }\u000A }()\u000A');codeLines.push(' time.Sleep(1600 * time.Millisecond)\u000A ticker.Stop()\u000A done \u003C- true\u000A fmt.Println(\"Ticker stopped\")\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/time generated
View File

@ -270,7 +270,7 @@ the Unix epoch.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A p :\x3D fmt.Println\u000A');codeLines.push(' now :\x3D time.Now()\u000A p(now)\u000A');codeLines.push(' then :\x3D time.Date(\u000A 2009, 11, 17, 20, 34, 58, 651387237, time.UTC)\u000A p(then)\u000A');codeLines.push(' p(then.Year())\u000A p(then.Month())\u000A p(then.Day())\u000A p(then.Hour())\u000A p(then.Minute())\u000A p(then.Second())\u000A p(then.Nanosecond())\u000A p(then.Location())\u000A');codeLines.push(' p(then.Weekday())\u000A');codeLines.push(' p(then.Before(now))\u000A p(then.After(now))\u000A p(then.Equal(now))\u000A');codeLines.push(' diff :\x3D now.Sub(then)\u000A p(diff)\u000A');codeLines.push(' p(diff.Hours())\u000A p(diff.Minutes())\u000A p(diff.Seconds())\u000A p(diff.Nanoseconds())\u000A');codeLines.push(' p(then.Add(diff))\u000A p(then.Add(-diff))\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A p :\u003D fmt.Println\u000A');codeLines.push(' now :\u003D time.Now()\u000A p(now)\u000A');codeLines.push(' then :\u003D time.Date(\u000A 2009, 11, 17, 20, 34, 58, 651387237, time.UTC)\u000A p(then)\u000A');codeLines.push(' p(then.Year())\u000A p(then.Month())\u000A p(then.Day())\u000A p(then.Hour())\u000A p(then.Minute())\u000A p(then.Second())\u000A p(then.Nanosecond())\u000A p(then.Location())\u000A');codeLines.push(' p(then.Weekday())\u000A');codeLines.push(' p(then.Before(now))\u000A p(then.After(now))\u000A p(then.Equal(now))\u000A');codeLines.push(' diff :\u003D now.Sub(then)\u000A p(diff)\u000A');codeLines.push(' p(diff.Hours())\u000A p(diff.Minutes())\u000A p(diff.Seconds())\u000A p(diff.Nanoseconds())\u000A');codeLines.push(' p(then.Add(diff))\u000A p(then.Add(-diff))\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/time-formatting-parsing generated
View File

@ -204,7 +204,7 @@ explaining the parsing problem.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A p :\x3D fmt.Println\u000A');codeLines.push(' t :\x3D time.Now()\u000A p(t.Format(time.RFC3339))\u000A');codeLines.push(' t1, e :\x3D time.Parse(\u000A time.RFC3339,\u000A \"2012-11-01T22:08:41+00:00\")\u000A p(t1)\u000A');codeLines.push(' p(t.Format(\"3:04PM\"))\u000A p(t.Format(\"Mon Jan _2 15:04:05 2006\"))\u000A p(t.Format(\"2006-01-02T15:04:05.999999-07:00\"))\u000A form :\x3D \"3 04 PM\"\u000A t2, e :\x3D time.Parse(form, \"8 41 PM\")\u000A p(t2)\u000A');codeLines.push(' fmt.Printf(\"%d-%02d-%02dT%02d:%02d:%02d-00:00\\n\",\u000A t.Year(), t.Month(), t.Day(),\u000A t.Hour(), t.Minute(), t.Second())\u000A');codeLines.push(' ansic :\x3D \"Mon Jan _2 15:04:05 2006\"\u000A _, e \x3D time.Parse(ansic, \"8:41PM\")\u000A p(e)\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A p :\u003D fmt.Println\u000A');codeLines.push(' t :\u003D time.Now()\u000A p(t.Format(time.RFC3339))\u000A');codeLines.push(' t1, e :\u003D time.Parse(\u000A time.RFC3339,\u000A \"2012-11-01T22:08:41+00:00\")\u000A p(t1)\u000A');codeLines.push(' p(t.Format(\"3:04PM\"))\u000A p(t.Format(\"Mon Jan _2 15:04:05 2006\"))\u000A p(t.Format(\"2006-01-02T15:04:05.999999-07:00\"))\u000A form :\u003D \"3 04 PM\"\u000A t2, e :\u003D time.Parse(form, \"8 41 PM\")\u000A p(t2)\u000A');codeLines.push(' fmt.Printf(\"%d-%02d-%02dT%02d:%02d:%02d-00:00\\n\",\u000A t.Year(), t.Month(), t.Day(),\u000A t.Hour(), t.Minute(), t.Second())\u000A');codeLines.push(' ansic :\u003D \"Mon Jan _2 15:04:05 2006\"\u000A _, e \u003D time.Parse(ansic, \"8:41PM\")\u000A p(e)\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/timeouts generated
View File

@ -181,7 +181,7 @@ out and the second succeeding.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' c1 :\x3D make(chan string, 1)\u000A go func() {\u000A time.Sleep(2 * time.Second)\u000A c1 \x3C- \"result 1\"\u000A }()\u000A');codeLines.push(' select {\u000A case res :\x3D \x3C-c1:\u000A fmt.Println(res)\u000A case \x3C-time.After(1 * time.Second):\u000A fmt.Println(\"timeout 1\")\u000A }\u000A');codeLines.push(' c2 :\x3D make(chan string, 1)\u000A go func() {\u000A time.Sleep(2 * time.Second)\u000A c2 \x3C- \"result 2\"\u000A }()\u000A select {\u000A case res :\x3D \x3C-c2:\u000A fmt.Println(res)\u000A case \x3C-time.After(3 * time.Second):\u000A fmt.Println(\"timeout 2\")\u000A }\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' c1 :\u003D make(chan string, 1)\u000A go func() {\u000A time.Sleep(2 * time.Second)\u000A c1 \u003C- \"result 1\"\u000A }()\u000A');codeLines.push(' select {\u000A case res :\u003D \u003C-c1:\u000A fmt.Println(res)\u000A case \u003C-time.After(1 * time.Second):\u000A fmt.Println(\"timeout 1\")\u000A }\u000A');codeLines.push(' c2 :\u003D make(chan string, 1)\u000A go func() {\u000A time.Sleep(2 * time.Second)\u000A c2 \u003C- \"result 2\"\u000A }()\u000A select {\u000A case res :\u003D \u003C-c2:\u000A fmt.Println(res)\u000A case \u003C-time.After(3 * time.Second):\u000A fmt.Println(\"timeout 2\")\u000A }\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/timers generated
View File

@ -184,7 +184,7 @@ a chance to fire.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' timer1 :\x3D time.NewTimer(2 * time.Second)\u000A');codeLines.push(' \x3C-timer1.C\u000A fmt.Println(\"Timer 1 fired\")\u000A');codeLines.push(' timer2 :\x3D time.NewTimer(time.Second)\u000A go func() {\u000A \x3C-timer2.C\u000A fmt.Println(\"Timer 2 fired\")\u000A }()\u000A stop2 :\x3D timer2.Stop()\u000A if stop2 {\u000A fmt.Println(\"Timer 2 stopped\")\u000A }\u000A');codeLines.push(' time.Sleep(2 * time.Second)\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' timer1 :\u003D time.NewTimer(2 * time.Second)\u000A');codeLines.push(' \u003C-timer1.C\u000A fmt.Println(\"Timer 1 fired\")\u000A');codeLines.push(' timer2 :\u003D time.NewTimer(time.Second)\u000A go func() {\u000A \u003C-timer2.C\u000A fmt.Println(\"Timer 2 fired\")\u000A }()\u000A stop2 :\u003D timer2.Stop()\u000A if stop2 {\u000A fmt.Println(\"Timer 2 stopped\")\u000A }\u000A');codeLines.push(' time.Sleep(2 * time.Second)\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/url-parsing generated
View File

@ -235,7 +235,7 @@ pieces that we extracted.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"net\"\u000A \"net/url\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' s :\x3D \"postgres://user:pass@host.com:5432/path?k\x3Dv#f\"\u000A');codeLines.push(' u, err :\x3D url.Parse(s)\u000A if err !\x3D nil {\u000A panic(err)\u000A }\u000A');codeLines.push(' fmt.Println(u.Scheme)\u000A');codeLines.push(' fmt.Println(u.User)\u000A fmt.Println(u.User.Username())\u000A p, _ :\x3D u.User.Password()\u000A fmt.Println(p)\u000A');codeLines.push(' fmt.Println(u.Host)\u000A host, port, _ :\x3D net.SplitHostPort(u.Host)\u000A fmt.Println(host)\u000A fmt.Println(port)\u000A');codeLines.push(' fmt.Println(u.Path)\u000A fmt.Println(u.Fragment)\u000A');codeLines.push(' fmt.Println(u.RawQuery)\u000A m, _ :\x3D url.ParseQuery(u.RawQuery)\u000A fmt.Println(m)\u000A fmt.Println(m[\"k\"][0])\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"net\"\u000A \"net/url\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' s :\u003D \"postgres://user:pass@host.com:5432/path?k\u003Dv#f\"\u000A');codeLines.push(' u, err :\u003D url.Parse(s)\u000A if err !\u003D nil {\u000A panic(err)\u000A }\u000A');codeLines.push(' fmt.Println(u.Scheme)\u000A');codeLines.push(' fmt.Println(u.User)\u000A fmt.Println(u.User.Username())\u000A p, _ :\u003D u.User.Password()\u000A fmt.Println(p)\u000A');codeLines.push(' fmt.Println(u.Host)\u000A host, port, _ :\u003D net.SplitHostPort(u.Host)\u000A fmt.Println(host)\u000A fmt.Println(port)\u000A');codeLines.push(' fmt.Println(u.Path)\u000A fmt.Println(u.Fragment)\u000A');codeLines.push(' fmt.Println(u.RawQuery)\u000A m, _ :\u003D url.ParseQuery(u.RawQuery)\u000A fmt.Println(m)\u000A fmt.Println(m[\"k\"][0])\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/values generated
View File

@ -152,7 +152,7 @@ basic examples.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' fmt.Println(\"go\" + \"lang\")\u000A');codeLines.push(' fmt.Println(\"1+1 \x3D\", 1+1)\u000A fmt.Println(\"7.0/3.0 \x3D\", 7.0/3.0)\u000A');codeLines.push(' fmt.Println(true \x26\x26 false)\u000A fmt.Println(true || false)\u000A fmt.Println(!true)\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' fmt.Println(\"go\" + \"lang\")\u000A');codeLines.push(' fmt.Println(\"1+1 \u003D\", 1+1)\u000A fmt.Println(\"7.0/3.0 \u003D\", 7.0/3.0)\u000A');codeLines.push(' fmt.Println(true \u0026\u0026 false)\u000A fmt.Println(true || false)\u000A fmt.Println(!true)\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/variables generated
View File

@ -183,7 +183,7 @@ initializing a variable, e.g. for
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' var a \x3D \"initial\"\u000A fmt.Println(a)\u000A');codeLines.push(' var b, c int \x3D 1, 2\u000A fmt.Println(b, c)\u000A');codeLines.push(' var d \x3D true\u000A fmt.Println(d)\u000A');codeLines.push(' var e int\u000A fmt.Println(e)\u000A');codeLines.push(' f :\x3D \"apple\"\u000A fmt.Println(f)\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' var a \u003D \"initial\"\u000A fmt.Println(a)\u000A');codeLines.push(' var b, c int \u003D 1, 2\u000A fmt.Println(b, c)\u000A');codeLines.push(' var d \u003D true\u000A fmt.Println(d)\u000A');codeLines.push(' var e int\u000A fmt.Println(e)\u000A');codeLines.push(' f :\u003D \"apple\"\u000A fmt.Println(f)\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/variadic-functions generated
View File

@ -172,7 +172,7 @@ to form closures, which we&rsquo;ll look at next.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func sum(nums ...int) {\u000A fmt.Print(nums, \" \")\u000A total :\x3D 0\u000A for _, num :\x3D range nums {\u000A total +\x3D num\u000A }\u000A fmt.Println(total)\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' sum(1, 2)\u000A sum(1, 2, 3)\u000A');codeLines.push(' nums :\x3D []int{1, 2, 3, 4}\u000A sum(nums...)\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func sum(nums ...int) {\u000A fmt.Print(nums, \" \")\u000A total :\u003D 0\u000A for _, num :\u003D range nums {\u000A total +\u003D num\u000A }\u000A fmt.Println(total)\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' sum(1, 2)\u000A sum(1, 2, 3)\u000A');codeLines.push(' nums :\u003D []int{1, 2, 3, 4}\u000A sum(nums...)\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/waitgroups generated
View File

@ -229,7 +229,7 @@ is likely to be different for each invocation.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"sync\"\u000A \"time\"\u000A)\u000A');codeLines.push('func worker(id int, wg *sync.WaitGroup) {\u000A');codeLines.push(' defer wg.Done()\u000A');codeLines.push(' fmt.Printf(\"Worker %d starting\\n\", id)\u000A');codeLines.push(' time.Sleep(time.Second)\u000A fmt.Printf(\"Worker %d done\\n\", id)\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' var wg sync.WaitGroup\u000A');codeLines.push(' for i :\x3D 1; i \x3C\x3D 5; i++ {\u000A wg.Add(1)\u000A go worker(i, \x26wg)\u000A }\u000A');codeLines.push(' wg.Wait()\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"sync\"\u000A \"time\"\u000A)\u000A');codeLines.push('func worker(id int, wg *sync.WaitGroup) {\u000A');codeLines.push(' defer wg.Done()\u000A');codeLines.push(' fmt.Printf(\"Worker %d starting\\n\", id)\u000A');codeLines.push(' time.Sleep(time.Second)\u000A fmt.Printf(\"Worker %d done\\n\", id)\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' var wg sync.WaitGroup\u000A');codeLines.push(' for i :\u003D 1; i \u003C\u003D 5; i++ {\u000A wg.Add(1)\u000A go worker(i, \u0026wg)\u000A }\u000A');codeLines.push(' wg.Wait()\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/worker-pools generated
View File

@ -224,7 +224,7 @@ there are 3 workers operating concurrently.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func worker(id int, jobs \x3C-chan int, results chan\x3C- int) {\u000A for j :\x3D range jobs {\u000A fmt.Println(\"worker\", id, \"started job\", j)\u000A time.Sleep(time.Second)\u000A fmt.Println(\"worker\", id, \"finished job\", j)\u000A results \x3C- j * 2\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' const numJobs \x3D 5\u000A jobs :\x3D make(chan int, numJobs)\u000A results :\x3D make(chan int, numJobs)\u000A');codeLines.push(' for w :\x3D 1; w \x3C\x3D 3; w++ {\u000A go worker(w, jobs, results)\u000A }\u000A');codeLines.push(' for j :\x3D 1; j \x3C\x3D numJobs; j++ {\u000A jobs \x3C- j\u000A }\u000A close(jobs)\u000A');codeLines.push(' for a :\x3D 1; a \x3C\x3D numJobs; a++ {\u000A \x3C-results\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func worker(id int, jobs \u003C-chan int, results chan\u003C- int) {\u000A for j :\u003D range jobs {\u000A fmt.Println(\"worker\", id, \"started job\", j)\u000A time.Sleep(time.Second)\u000A fmt.Println(\"worker\", id, \"finished job\", j)\u000A results \u003C- j * 2\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' const numJobs \u003D 5\u000A jobs :\u003D make(chan int, numJobs)\u000A results :\u003D make(chan int, numJobs)\u000A');codeLines.push(' for w :\u003D 1; w \u003C\u003D 3; w++ {\u000A go worker(w, jobs, results)\u000A }\u000A');codeLines.push(' for j :\u003D 1; j \u003C\u003D numJobs; j++ {\u000A jobs \u003C- j\u000A }\u000A close(jobs)\u000A');codeLines.push(' for a :\u003D 1; a \u003C\u003D numJobs; a++ {\u000A \u003C-results\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/writing-files generated
View File

@ -289,7 +289,7 @@ we&rsquo;ve just seen to the <code>stdin</code> and <code>stdout</code> streams.
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"bufio\"\u000A \"fmt\"\u000A \"io/ioutil\"\u000A \"os\"\u000A)\u000A');codeLines.push('func check(e error) {\u000A if e !\x3D nil {\u000A panic(e)\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' d1 :\x3D []byte(\"hello\\ngo\\n\")\u000A err :\x3D ioutil.WriteFile(\"/tmp/dat1\", d1, 0644)\u000A check(err)\u000A');codeLines.push(' f, err :\x3D os.Create(\"/tmp/dat2\")\u000A check(err)\u000A');codeLines.push(' defer f.Close()\u000A');codeLines.push(' d2 :\x3D []byte{115, 111, 109, 101, 10}\u000A n2, err :\x3D f.Write(d2)\u000A check(err)\u000A fmt.Printf(\"wrote %d bytes\\n\", n2)\u000A');codeLines.push(' n3, err :\x3D f.WriteString(\"writes\\n\")\u000A check(err)\u000A fmt.Printf(\"wrote %d bytes\\n\", n3)\u000A');codeLines.push(' f.Sync()\u000A');codeLines.push(' w :\x3D bufio.NewWriter(f)\u000A n4, err :\x3D w.WriteString(\"buffered\\n\")\u000A check(err)\u000A fmt.Printf(\"wrote %d bytes\\n\", n4)\u000A');codeLines.push(' w.Flush()\u000A');codeLines.push('}\u000A');codeLines.push('');codeLines.push('');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"bufio\"\u000A \"fmt\"\u000A \"io/ioutil\"\u000A \"os\"\u000A)\u000A');codeLines.push('func check(e error) {\u000A if e !\u003D nil {\u000A panic(e)\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' d1 :\u003D []byte(\"hello\\ngo\\n\")\u000A err :\u003D ioutil.WriteFile(\"/tmp/dat1\", d1, 0644)\u000A check(err)\u000A');codeLines.push(' f, err :\u003D os.Create(\"/tmp/dat2\")\u000A check(err)\u000A');codeLines.push(' defer f.Close()\u000A');codeLines.push(' d2 :\u003D []byte{115, 111, 109, 101, 10}\u000A n2, err :\u003D f.Write(d2)\u000A check(err)\u000A fmt.Printf(\"wrote %d bytes\\n\", n2)\u000A');codeLines.push(' n3, err :\u003D f.WriteString(\"writes\\n\")\u000A check(err)\u000A fmt.Printf(\"wrote %d bytes\\n\", n3)\u000A');codeLines.push(' f.Sync()\u000A');codeLines.push(' w :\u003D bufio.NewWriter(f)\u000A n4, err :\u003D w.WriteString(\"buffered\\n\")\u000A check(err)\u000A fmt.Printf(\"wrote %d bytes\\n\", n4)\u000A');codeLines.push(' w.Flush()\u000A');codeLines.push('}\u000A');codeLines.push('');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

2
public/xml generated
View File

@ -281,7 +281,7 @@ to nest all <code>plant</code>s under <code>&lt;parent&gt;&lt;child&gt;...</code
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"encoding/xml\"\u000A \"fmt\"\u000A)\u000A');codeLines.push('type Plant struct {\u000A XMLName xml.Name `xml:\"plant\"`\u000A Id int `xml:\"id,attr\"`\u000A Name string `xml:\"name\"`\u000A Origin []string `xml:\"origin\"`\u000A}\u000A');codeLines.push('func (p Plant) String() string {\u000A return fmt.Sprintf(\"Plant id\x3D%v, name\x3D%v, origin\x3D%v\",\u000A p.Id, p.Name, p.Origin)\u000A}\u000A');codeLines.push('func main() {\u000A coffee :\x3D \x26Plant{Id: 27, Name: \"Coffee\"}\u000A coffee.Origin \x3D []string{\"Ethiopia\", \"Brazil\"}\u000A');codeLines.push(' out, _ :\x3D xml.MarshalIndent(coffee, \" \", \" \")\u000A fmt.Println(string(out))\u000A');codeLines.push(' fmt.Println(xml.Header + string(out))\u000A');codeLines.push(' var p Plant\u000A if err :\x3D xml.Unmarshal(out, \x26p); err !\x3D nil {\u000A panic(err)\u000A }\u000A fmt.Println(p)\u000A');codeLines.push(' tomato :\x3D \x26Plant{Id: 81, Name: \"Tomato\"}\u000A tomato.Origin \x3D []string{\"Mexico\", \"California\"}\u000A');codeLines.push(' type Nesting struct {\u000A XMLName xml.Name `xml:\"nesting\"`\u000A Plants []*Plant `xml:\"parent\x3Echild\x3Eplant\"`\u000A }\u000A');codeLines.push(' nesting :\x3D \x26Nesting{}\u000A nesting.Plants \x3D []*Plant{coffee, tomato}\u000A');codeLines.push(' out, _ \x3D xml.MarshalIndent(nesting, \" \", \" \")\u000A fmt.Println(string(out))\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"encoding/xml\"\u000A \"fmt\"\u000A)\u000A');codeLines.push('type Plant struct {\u000A XMLName xml.Name `xml:\"plant\"`\u000A Id int `xml:\"id,attr\"`\u000A Name string `xml:\"name\"`\u000A Origin []string `xml:\"origin\"`\u000A}\u000A');codeLines.push('func (p Plant) String() string {\u000A return fmt.Sprintf(\"Plant id\u003D%v, name\u003D%v, origin\u003D%v\",\u000A p.Id, p.Name, p.Origin)\u000A}\u000A');codeLines.push('func main() {\u000A coffee :\u003D \u0026Plant{Id: 27, Name: \"Coffee\"}\u000A coffee.Origin \u003D []string{\"Ethiopia\", \"Brazil\"}\u000A');codeLines.push(' out, _ :\u003D xml.MarshalIndent(coffee, \" \", \" \")\u000A fmt.Println(string(out))\u000A');codeLines.push(' fmt.Println(xml.Header + string(out))\u000A');codeLines.push(' var p Plant\u000A if err :\u003D xml.Unmarshal(out, \u0026p); err !\u003D nil {\u000A panic(err)\u000A }\u000A fmt.Println(p)\u000A');codeLines.push(' tomato :\u003D \u0026Plant{Id: 81, Name: \"Tomato\"}\u000A tomato.Origin \u003D []string{\"Mexico\", \"California\"}\u000A');codeLines.push(' type Nesting struct {\u000A XMLName xml.Name `xml:\"nesting\"`\u000A Plants []*Plant `xml:\"parent\u003Echild\u003Eplant\"`\u000A }\u000A');codeLines.push(' nesting :\u003D \u0026Nesting{}\u000A nesting.Plants \u003D []*Plant{coffee, tomato}\u000A');codeLines.push(' out, _ \u003D xml.MarshalIndent(nesting, \" \", \" \")\u000A fmt.Println(string(out))\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>

0
vendor/pygments/.hgignore → third_party/pygments/.hgignore vendored
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vendor/pygments/Pygments.egg-info/entry_points.txt → third_party/pygments/Pygments.egg-info/entry_points.txt vendored
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vendor/pygments/Pygments.egg-info/not-zip-safe → third_party/pygments/Pygments.egg-info/not-zip-safe vendored
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vendor/pygments/Pygments.egg-info/top_level.txt → third_party/pygments/Pygments.egg-info/top_level.txt vendored
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vendor/pygments/README.rst → third_party/pygments/README.rst vendored
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vendor/pygments/TODO → third_party/pygments/TODO vendored
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vendor/pygments/doc/Makefile → third_party/pygments/doc/Makefile vendored
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vendor/pygments/doc/_static/favicon.ico → third_party/pygments/doc/_static/favicon.ico vendored
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