updates

028-new/new.go

@@ -1,3 +1,5 @@
+// ## New
+
 package main
 
 import "fmt"

029-structs/structs.go

@@ -1,3 +1,5 @@
+// ## Structs
+
 package main
 
 import "fmt"

030-fields/fields.go

@@ -1,3 +1,5 @@
+// ## Struct Fields
+
 package main
 
 import "fmt"

031-methods/methods.go

@@ -1,3 +1,5 @@
+// ## Methods
+
 package main
 
 import "fmt"

032-embedding/embedding.go

@@ -1,7 +1,9 @@
+// ## Embedding
+
 package main
 
-import "fmt"
 import "math"
+import "fmt"
 
 type Shape interface {
     area() float64

033-interfaces/interfaces.go

@@ -1,7 +1,9 @@
+// ## Interfaces
+
 package main
 
 import "fmt"
 
 type Shape interface {
     area() float64
-}
+}

034-goroutines/goroutines.go

@@ -1,3 +1,5 @@
+// ## Goroutines
+
 package main
 
 import "fmt"

035-concurrency/concurrency.go

@@ -1,10 +1,10 @@
+// ## Concurrent Goroutines
+
 package main
 
-import (
-	"fmt"
-	"time"
-	"math/rand"
-)
+import "time"
+import "math/rand"
+import "fmt"
 
 func f(n int) {
     for i := 0; i < 10; i++ {

036-channels/channels.go

@@ -1,3 +1,5 @@
+// ## Channels
+
 package main
 
 import "fmt"

037-buffering/buffering.go

@@ -1,3 +1,5 @@
+// ## Channel Buffering
+
 package main
 
 import "fmt"

038-directions/directions.go

@@ -1,3 +1,5 @@
+// ## Channel Directions
+
 package main
 
 import "fmt"

039-synchronization/synchronization.go

@@ -1,23 +1,32 @@
-package main                     // We can use channels to synchronize execution
-                                 // accross goroutines. Here's an example of waiting
-import "fmt"                     // for another goroutine to finish.
+// ## Synchronization
+
+// We can use channels to synchronize execution
+// accross goroutines. Here's an example of waiting
+// for another goroutine to finish.
+
+package main                     
+                                 
+import "fmt"                     
 import "time"
 
-func worker(done chan<- bool) {  // The `done` channel will be used for
-    fmt.Print("Working...")      // synchronization.
+// The `done` channel will be used for
+// synchronization.
+func worker(done chan<- bool) {  
+    fmt.Print("Working...")      
     time.Sleep(time.Second)
     fmt.Println(" done")
-    done <- true                 // Send a value to notify that the work is done.
+
+    // Send a value to notify that the work is done.
+    done <- true                 
 }
 
 func main() {
-    done := make(chan bool, 1)   // Start a worker goroutine, give it the channel to
-    go worker(done)              // notify on.
-
-    <- done                      // Block until we can receive a value from the worker
-}                                // over the channel.
-
-/*
-$ go run synchronization.go      // If you commented out the `<- done` line, the
-Working... done                  // program would exit before the `worker` even
-*/                               // started.
+    // Start a worker goroutine, give it the channel to
+    // notify on.
+    done := make(chan bool, 1)   
+    go worker(done)              
+    
+    // Block until we can receive a value from the worker
+    // over the channel.
+    <- done                      
+}                                

039-synchronization/synchronization.sh

@@ -0,0 +1,6 @@
+$ go run synchronization.go      
+Working... done                  
+
+# If you commented out the `<- done` line, the
+# program would exit before the `worker` even
+# started.