Channel select

main.go

package main

import (
	"fmt"
	"time"
)

func main() {

	slowChan := make(chan string)
	fastChan := make(chan string)

	go func() {
		for {
			slowChan <- "message from slow worker"
			time.Sleep(time.Duration(2) * time.Second)
		}
		close(slowChan)

	}()

	go func() {
		for {
			fastChan <- "message from fast worker"
			time.Sleep(time.Duration(500) * time.Millisecond)
		}
		close(fastChan)

	}()

	for {
		select {
		case out := <-slowChan:
			fmt.Println(out)
		case out := <-fastChan:
			fmt.Println(out)
		}
	}
}