LukasMeine / vigilance

node_modules/deep-extend/index.js

/*!
 * Node.JS module "Deep Extend"
 * @description Recursive object extending.
 * @author Viacheslav Lotsmanov (unclechu) <lotsmanov89@gmail.com>
 * @license MIT
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2013 Viacheslav Lotsmanov
 *
 * 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.
 */

/**
 * Extening object that entered in first argument.
 * Returns extended object or false if have no target object or incorrect type.
 * If you wish to clone object, simply use that:
 *  deepExtend({}, yourObj_1, [yourObj_N]) - first arg is new empty object
 */
var deepExtend = module.exports = function (/*obj_1, [obj_2], [obj_N]*/) {
	if (arguments.length < 1 || typeof arguments[0] !== 'object') {
		return false;
	}

	if (arguments.length < 2) return arguments[0];

Curly braces around statements make for more readable code and help prevent bugs when you add further statements.

	var target = arguments[0];

	// convert arguments to array and cut off target object
	var args = Array.prototype.slice.call(arguments, 1);

	var key, val, src, clone, tmpBuf;

	args.forEach(function (obj) {
		if (typeof obj !== 'object') return;

Curly braces around statements make for more readable code and help prevent bugs when you add further statements.

		for (key in obj) {
			if ( ! (key in obj)) continue;

The variable key is changed by the for-each loop on line 52. Only the value of the last iteration will be visible in this function if it is called outside of the loop.

Curly braces around statements make for more readable code and help prevent bugs when you add further statements.

			src = target[key];
			val = obj[key];

			if (val === target) continue;

Curly braces around statements make for more readable code and help prevent bugs when you add further statements.

The variable val is changed as part of the for-each loop for example by obj.key on line 56. Only the value of the last iteration will be visible in this function if it is called after the loop.

			if (typeof val !== 'object' || val === null) {
				target[key] = val;
				continue;
			} else if (val instanceof Buffer) {

The variable Buffer seems to be never declared. If this is a global, consider adding a /** global: Buffer */ comment.

				tmpBuf = new Buffer(val.length);
				val.copy(tmpBuf);

The variable tmpBuf is changed as part of the for-each loop for example by new Buffer(val.length) on line 64. Only the value of the last iteration will be visible in this function if it is called after the loop.

				target[key] = tmpBuf;
				continue;
			} else if (val instanceof Date) {
				target[key] = new Date(val.getTime());
				continue;
			}

			if (typeof src !== 'object' || src === null) {

The variable src is changed as part of the for-each loop for example by target.key on line 55. Only the value of the last iteration will be visible in this function if it is called after the loop.

				clone = (Array.isArray(val)) ? [] : {};
				target[key] = deepExtend(clone, val);

The variable clone is changed as part of the for-each loop for example by Array.isArray(val) ? []: {} on line 74. Only the value of the last iteration will be visible in this function if it is called after the loop.

				continue;
			}

			if (Array.isArray(val)) {
				clone = (Array.isArray(src)) ? src : [];
			} else {
				clone = (!Array.isArray(src)) ? src : {};
			}

			target[key] = deepExtend(clone, val);
		}
	});

	return target;
}