scheme.go
func has(a []string, b string) bool {
	for _, s := range a {
		if s == b {
			return true
		}
	}

	return false
}
func has(a []string, b string) bool {
	for _, s := range a {
		if s == b {
			return true
		}
	}

	return false
}
func has ( a [ ] string , b string ) bool { for _ , s := range a { if s == b { return true } } return false }
// has is a util func to determine if a contains b.
has is a util func to determine if a contains b .