reeddunkle · July 31, 2019 14:56
diff --git a/foldBy.js b/foldBy.js
 function foldBy(constructor, arr) {
  if (!arr.length) return null;
  const [item, ...rest] = arr;

  return constructor(item, foldBy(constructor, rest));
 }
	function foldBy(constructor, arr) {
	if (!arr.length) return null;
	const [item, ...rest] = arr;

	return constructor(item, foldBy(constructor, rest));
	}