jooyunghan · January 9, 2018 06:53
diff --git a/phonenumber.js b/phonenumber.js
 const traverse = (f, as) => sequence(map(f, as));

 const sequence = (as) => {
  if (as.length === 0) return [""];
  return flatMap(a => map(b => [a, ...b], sequence(as.slice(1))), as[0])
 }
	const traverse = (f, as) => sequence(map(f, as));

	const sequence = (as) => {
	if (as.length === 0) return [""];
	return flatMap(a => map(b => [a, ...b], sequence(as.slice(1))), as[0])
	}