File: merge.js

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/*!
 * @name JavaScript/NodeJS Merge v1.2.0
 * @author yeikos
 * @repository https://github.com/yeikos/js.merge

 * Copyright 2014 yeikos - MIT license
 * https://raw.github.com/yeikos/js.merge/master/LICENSE
 */

;(function(isNode) {

	/**
	 * Merge one or more objects 
	 * @param bool? clone
	 * @param mixed,... arguments
	 * @return object
	 */

	var Public = function(clone) {

		return merge(clone === true, false, arguments);

	}, publicName = 'merge';

	/**
	 * Merge two or more objects recursively 
	 * @param bool? clone
	 * @param mixed,... arguments
	 * @return object
	 */

	Public.recursive = function(clone) {

		return merge(clone === true, true, arguments);

	};

	/**
	 * Clone the input removing any reference
	 * @param mixed input
	 * @return mixed
	 */

	Public.clone = function(input) {

		var output = input,
			type = typeOf(input),
			index, size;

		if (type === 'array') {

			output = [];
			size = input.length;

			for (index=0;index<size;++index)

				output[index] = Public.clone(input[index]);

		} else if (type === 'object') {

			output = {};

			for (index in input)

				output[index] = Public.clone(input[index]);

		}

		return output;

	};

	/**
	 * Merge two objects recursively
	 * @param mixed input
	 * @param mixed extend
	 * @return mixed
	 */

	function merge_recursive(base, extend) {

		if (typeOf(base) !== 'object')

			return extend;

		for (var key in extend) {

			if (typeOf(base[key]) === 'object' && typeOf(extend[key]) === 'object') {

				base[key] = merge_recursive(base[key], extend[key]);

			} else {

				base[key] = extend[key];

			}

		}

		return base;

	}

	/**
	 * Merge two or more objects
	 * @param bool clone
	 * @param bool recursive
	 * @param array argv
	 * @return object
	 */

	function merge(clone, recursive, argv) {

		var result = argv[0],
			size = argv.length;

		if (clone || typeOf(result) !== 'object')

			result = {};

		for (var index=0;index<size;++index) {

			var item = argv[index],

				type = typeOf(item);

			if (type !== 'object') continue;

			for (var key in item) {

				var sitem = clone ? Public.clone(item[key]) : item[key];

				if (recursive) {

					result[key] = merge_recursive(result[key], sitem);

				} else {

					result[key] = sitem;

				}

			}

		}

		return result;

	}

	/**
	 * Get type of variable
	 * @param mixed input
	 * @return string
	 *
	 * @see http://jsperf.com/typeofvar
	 */

	function typeOf(input) {

		return ({}).toString.call(input).slice(8, -1).toLowerCase();

	}

	if (isNode) {

		module.exports = Public;

	} else {

		window[publicName] = Public;

	}

})(typeof module === 'object' && module && typeof module.exports === 'object' && module.exports);