Refactor Maps (#2)

src/funky.js

@@ -64,6 +64,12 @@ export function find (obj, predicate) {
 	}
 }
 
+export function flatten (list) {
+	if (Array.isArray(list)) {
+		return list.reduce((memo, element) => memo.concat(Array.isArray(element) ? flatten(element) : element), []);
+	}
+}
+
 export function forEach (obj, iteratee) {
 	if (Array.isArray(obj)) {
 		// native 'forEach' but the return below allows us to chain
@@ -250,6 +256,7 @@ export let _ = {
 	contains,
 	filter,
 	find,
+	flatten,
 	forEach,
 	groupBy,
 	identity,