gobook channels non blocking wait

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package main

import (
	"fmt"
	"time"
)

// :show start
func main() {
	ch := make(chan int, 1)

end:
	for {
		select {
		case n := <-ch:
			fmt.Printf("Received %d from a channel\n", n)
			break end
		default:
			fmt.Print("Channel is empty\n")
			ch <- 8
		}
		// wait for channel to be filled with values
		// don't use time.Sleep() like that in production code
		time.Sleep(20 * time.Millisecond)
	}
}

// :show end