go concurrency pattern

fanin.go

package main

import (
	"fmt"
	"time"
	"math/rand"
)

func main() {
	c := fanIn(boring("joe"),boring("Ann"))
	for i := 0; i < 10; i++ {
		fmt.Println(<-c)
	}
	fmt.Println("You're both boring; I'm leaving.")
}

func fanIn(inputs ... <-chan string) <-chan string {
	c := make(chan string)
	for _, input := range inputs {
		go func(i <-chan string) {
			for {
				c <- <-i
			}
		}(input)
	}
	return c
}

func boring(msg string) <-chan string {
	c := make(chan string)
	go func() {
		for i := 0; ; i++ {
			c <- fmt.Sprintf("%s %d", msg, i)
			time.Sleep(time.Duration(rand.Intn(1e3)) * time.Millisecond)
		}
	}()
	return c
}