ovidiubute/metricador

/*
 * The MIT License (MIT)
 * Copyright (c) 2016 Ovidiu Bute ovidiu.bute@gmail.com
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
 *  and associated documentation files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom
 * the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
 * FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

"use strict";

module.exports = {
    // Source code located: http://gomakethings.com/vanilla-javascript-version-of-jquery-extend/
    extend: function () {

        // Variables
        var extended = {};
        var deep = false;
        var i = 0;
        var length = arguments.length;

        // Check if a deep merge
        if (Object.prototype.toString.call(arguments[0]) === '[object Boolean]') {
            deep = arguments[0];
            i++;
        }

        // Merge the object into the extended object
        var merge = function (obj) {
            for (var prop in obj) {
                if (Object.prototype.hasOwnProperty.call(obj, prop)) {
                    // If deep merge and property is an object, merge properties
                    if (deep && Object.prototype.toString.call(obj[prop]) === '[object Object]') {
                        extended[prop] = extend(true, extended[prop], obj[prop]);
                    } else {
                        extended[prop] = obj[prop];
                    }
                }
            }
        };

        // Loop through each object and conduct a merge
        for (; i < length; i++) {
            var obj = arguments[i];
            merge(obj);
        }

        return extended;

    }
};