example of using range/close/for with channels

concurrency/range-close/go.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"fmt"
+)
+
+func fibonacci(n int, c chan uint64) {
+	var x, y uint64 = 0, 1
+	for i := 0; i < n; i++ {
+		c <- x
+		x, y = y, x+y
+	}
+	close(c)
+}
+
+func main() {
+	fc := make(chan uint64, 80)
+	go fibonacci(cap(fc), fc)
+	for i := range fc {
+		fmt.Println(i)
+	}
+}