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Add example of the new clear() builtin for maps in 1.21

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updates #481

Also bump go.mod to 1.21
This commit is contained in:
Eli Bendersky 2023-08-21 06:15:47 -07:00
parent 1ee3369f02
commit d51586e6bf
5 changed files with 27 additions and 5 deletions
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5
examples/maps/maps.go
View File

@ -39,6 +39,11 @@ func main() {
delete(m, "k2")
fmt.Println("map:", m)
// To remove *all* key/value pairs from a map, use
// the `clear` builtin.
clear(m)
fmt.Println("map:", m)
// The optional second return value when getting a
// value from a map indicates if the key was present
// in the map. This can be used to disambiguate

4
examples/maps/maps.hash
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@ -1,2 +1,2 @@
0d764945481b4960c573e67f7d303166b750413e
xl_teZEVqbo
b976324013ef31370d1605d1834c5dd6f0db0ea1
6gcPOX9Mm1R

1
examples/maps/maps.sh
View File

@ -6,5 +6,6 @@ v1: 7
v3: 0
len: 2
map: map[k1:7]
map: map[]
prs: false
map: map[bar:2 foo:1]

2
go.mod
View File

@ -1,6 +1,6 @@
module github.com/mmcgrana/gobyexample
go 1.19
go 1.21
require (
github.com/alecthomas/chroma v0.8.2

20
public/maps generated
View File

@ -42,7 +42,7 @@
</td>
<td class="code leading">
<a href="https://go.dev/play/p/xl_teZEVqbo"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
<a href="https://go.dev/play/p/6gcPOX9Mm1R"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
<pre class="chroma"><span class="kn">package</span> <span class="nx">main</span>
</pre>
</td>
@ -172,6 +172,21 @@ a map.</p>
</td>
</tr>
<tr>
<td class="docs">
<p>To remove <em>all</em> key/value pairs from a map, use
the <code>clear</code> builtin.</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nf">clear</span><span class="p">(</span><span class="nx">m</span><span class="p">)</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="s">&#34;map:&#34;</span><span class="p">,</span> <span class="nx">m</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>The optional second return value when getting a
@ -227,6 +242,7 @@ printed with <code>fmt.Println</code>.</p>
</span><span class="go">v3: 0
</span><span class="go">len: 2
</span><span class="go">map: map[k1:7]
</span><span class="go">map: map[]
</span><span class="go">prs: false
</span><span class="go">map: map[bar:2 foo:1]</span></pre>
</td>
@ -247,7 +263,7 @@ 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 :\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(' v3 :\u003D m[\"k3\"]\u000A fmt.Println(\"v3:\", v3)\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('');
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(' v3 :\u003D m[\"k3\"]\u000A fmt.Println(\"v3:\", v3)\u000A');codeLines.push(' fmt.Println(\"len:\", len(m))\u000A');codeLines.push(' delete(m, \"k2\")\u000A fmt.Println(\"map:\", m)\u000A');codeLines.push(' clear(m)\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>