2016 Update

Task/Permutations/JavaScript/permutations-6.js

@@ -0,0 +1,19 @@
+(function (lst) {
+    'use strict';
+
+    const permutations = (xs) => xs.length ? (
+            flatMap((x) => flatMap((xs) => [[x].concat(xs)],
+                permutations(del(x, xs))), xs)
+        ) : [[]],
+
+        flatMap = (f, xs) => [].concat.apply([], xs.map(f)),
+
+        del = (x, xs) => xs.length ? x === xs[0] ? (
+            xs.slice(1)
+        ) : [xs[0]].concat(del(x, xs.slice(1))
+        ) : [];
+
+
+    return permutations(lst);
+
+})(["Aardvarks", "eat", "ants"]);