extend.js

/* Highly dumbed down version of https://github.com/unclechu/node-deep-extend */

/**
 * 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 source object (without modify it), just use empty new
 * object as first argument, like this:
 *   deepExtend({}, yourObj_1, [yourObj_N]);
 */
module.exports = function deepExtend(/*obj_1, [obj_2], [obj_N]*/) {
	if (arguments.length < 1 || typeof arguments[0] !== "object") {
		return false
	}

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

	var target = arguments[0]

	for (var i = 1; i < arguments.length; i++) {
		var obj = arguments[i]

		for (var key in obj) {
			var src = target[key]
			var val = obj[key]

			if (typeof val !== "object" || val === null) {
				target[key] = val

				// just clone arrays (and recursive clone objects inside)
			} else if (typeof src !== "object" || src === null) {
				target[key] = deepExtend({}, val)

				// source value and new value is objects both, extending...
			} else {
				target[key] = deepExtend(src, val)
			}
		}
	}

	return target
}