Pick N random values from a slice

sample.go

func min(x, y int) int {
	if x > y {
		return y
	} else {
		return x
	}
}

func Sample(source []int, count int) []int {
	count = min(count, len(source))
	target := make([]int, count)
	
	for targetIndex, sourceIndex := range rand.Perm(len(source))[:count] {
		target[targetIndex] = source[sourceIndex]
	}
	
	return target
}