tasks a-s

Task/Queue-Usage/Go/queue-usage-2.go

@@ -0,0 +1,36 @@
+package main
+
+import "fmt"
+
+func main() {
+    q := make(chan string, 3)
+    fmt.Println("empty?", len(q) == 0)
+
+    x := "black"
+    fmt.Println("push", x)
+    q <- x
+
+    fmt.Println("empty?", len(q) == 0)
+    select {
+    case r := <-q:
+        fmt.Println(r, "popped")
+    default:
+        fmt.Println("pop failed")
+    }
+
+    var n int
+    for _, x := range []string{"blue", "red", "green"} {
+        fmt.Println("pushing", x)
+        q <- x
+        n++
+    }
+
+    for i := 0; i < n; i++ {
+        select {
+        case r := <-q:
+            fmt.Println(r, "popped")
+        default:
+            fmt.Println("pop failed")
+        }
+    }
+}