Izmjenjena struktura, dodan backand

web/node_modules/es5-ext/array/#/keys/implement.js

@@ -0,0 +1,8 @@
+"use strict";
+
+if (!require("./is-implemented")()) {
+	Object.defineProperty(Array.prototype, "keys", { value: require("./shim"),
+		configurable: true,
+enumerable: false,
+writable: true });
+}

web/node_modules/es5-ext/array/#/keys/index.js

@@ -0,0 +1,4 @@
+"use strict";
+
+module.exports = require("./is-implemented")()
+		? Array.prototype.keys : require("./shim");

web/node_modules/es5-ext/array/#/keys/is-implemented.js

@@ -0,0 +1,14 @@
+"use strict";
+
+module.exports = function () {
+	var arr = [1, "foo"], iterator, result;
+	if (typeof arr.keys !== "function") return false;
+	iterator = arr.keys();
+	if (!iterator) return false;
+	if (typeof iterator.next !== "function") return false;
+	result = iterator.next();
+	if (!result) return false;
+	if (result.value !== 0) return false;
+	if (result.done !== false) return false;
+	return true;
+};

web/node_modules/es5-ext/array/#/keys/shim.js

@@ -0,0 +1,6 @@
+"use strict";
+
+var ArrayIterator = require("es6-iterator/array");
+module.exports = function () {
+ return new ArrayIterator(this, "key");
+};