channel-of-channels.go

package main

import (
	"fmt"
	"time"
)

func emit(channelCh chan chan string, doneCh chan bool) {
	wordCh := make(chan string)
	defer close(wordCh) // close on return
	channelCh <- wordCh // send word channel down the channe channel :-)

	words := []string{"The", "quick", "brown", "fox"}

	timer := time.NewTimer(3 * time.Second)
	i := 0

	for {
		select {
		case wordCh <- words[i]: // someone is receiving from the channel
			i++
			if i == len(words) {
				i = 0
			}
		case <-timer.C: // timer kicks in
			return
		}
	}
}

func main() {
	channelCh := make(chan chan string)
	doneCh := make(chan bool)

	go emit(channelCh, doneCh)

	// get the channel from the channel
	wordCh := <-channelCh

	for word := range wordCh {
		fmt.Printf("%s ", word)
	}
}