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diff --git a/tools/addon-sdk-1.7/packages/api-utils/lib/array.js b/tools/addon-sdk-1.7/packages/api-utils/lib/array.js
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@@ -0,0 +1,69 @@
+/* vim:set ts=2 sw=2 sts=2 et: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+/**
+ * Returns `true` if given `array` contain given `element` or `false`
+ * otherwise.
+ * @param {Array} array
+ *    Target array.
+ * @param {Object|String|Number|Boolean} element
+ *    Element being looked up.
+ * @returns {Boolean}
+ */
+var has = exports.has = function has(array, element) {
+  // shorter and faster equivalent of `array.indexOf(element) >= 0`
+  return !!~array.indexOf(element);
+};
+
+/**
+ * Adds given `element` to the given `array` if it does not contain it yet.
+ * `true` is returned if element was added otherwise `false` is returned.
+ * @param {Array} array
+ *    Target array.
+ * @param {Object|String|Number|Boolean} element
+ *    Element to be added.
+ * @returns {Boolean}
+ */
+var add = exports.add = function add(array, element) {
+  var result;
+  if ((result = !has(array, element)))
+    array.push(element);
+
+  return result;
+};
+
+/**
+ * Removes first occurrence of the given `element` from the given `array`. If
+ * `array` does not contain given `element` `false` is returned otherwise
+ * `true` is returned.
+ * @param {Array} array
+ *    Target array.
+ * @param {Object|String|Number|Boolean} element
+ *    Element to be removed.
+ * @returns {Boolean}
+ */
+exports.remove = function remove(array, element) {
+  var result;
+  if ((result = has(array, element)))
+    array.splice(array.indexOf(element), 1);
+
+  return result;
+};
+
+/**
+ * Produces a duplicate-free version of the given `array`.
+ * @param {Array} array
+ *    Source array.
+ * @returns {Array}
+ */
+exports.unique = function unique(array) {
+  var value = [];
+  return array.forEach(function(element) {
+    add(value, element);
+  });
+  return value;
+};