gist 1 for episode 28 of justforfunc

main.go

func mergeRec(chans ...<-chan int) <-chan int {
	switch len(chans) {
	case 0:
		c := make(chan int)
		close(c)
		return c
	case 1:
		return chans[0]
	default:
		m := len(chans) / 2
		return mergeTwo(
			mergeRec(chans[:m]...),
			mergeRec(chans[m:]...))
	}
}