goroutine with multiplex

multiplex.go

package main

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

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
}

func fanIn(input1, input2 <-chan string) <-chan string {
    c := make(chan string)

    go func () { for { c <- <-input1 }}()
    go func () { for { c <- <-input2 }}()

    return c
}

func fanIn2(input1, input2 <-chan string) <-chan string {
    c := make(chan string)

    go func () {
        for {
            select {
            case s := <- input1: c <- s
            case s := <- input2: c <- s
            }
        }
    }()

    return c
}

func main() {
    c := fanIn2(boring("Joe"), boring("Ann"))

    for i := 0; i < 10; i++ {
        fmt.Println(<-c)
    }

    fmt.Println("You are both boring; I'm leaving")
}