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/* 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;
};
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