publish channel-buffering

examples.txt

@@ -26,7 +26,7 @@ Recursion
 # OK Guards
 Goroutines
 Channels
-# Channel Buffering
+Channel Buffering
 # Channel Directions
 # Synchronization
 Select

examples/channel-buffering/channel-buffering.go

@@ -1,10 +1,27 @@
+// By default channels are _unbuffered_, meaning that they
+// will only accept sends (`chan <-`) if there is a
+// corresponding receive (`<- chan`) ready to receive the
+// sent value. _Buffered channels_ accept a limited
+// number of  values without a corresponding receiver for
+// those values.
+
 package main
 
 import "fmt"
 
 func main() {
-    var messages chan string = make(chan string, 1)
+
-    messages <- "ping"
+    // Here we `make` a channel of strings buffering up to
-    msg := <-messages
+    // 2 values.
-    fmt.Println(msg)
+    messages := make(chan string, 2)
+
+    // Because this channel is buffered, we can send these
+    // values into the channel without a corresponding
+    // concurrent receive.
+    messages <- "buffered"
+    messages <- "channel"
+
+    // Later we can receive these two values as usual.
+    fmt.Println(<-messages)
+    fmt.Println(<-messages)
 }

examples/channel-buffering/channel-buffering.sh

@@ -0,0 +1,3 @@
+$ go run channel-buffering.go 
+buffered
+channel