rest-template/util/mixin.js

HTTP client library inspired by the Spring Framework's RestTemplate

(function (define) {

	define([], function () {
		"use strict";

		// derived from dojo.mixin

		var empty = {};

		function _mixin(dest, source, copyFunc) {
			var name, s;

			for (name in source) {
				// the (!(name in empty) || empty[name] !== s) condition avoids copying properties in "source"
				// inherited from Object.prototype. For example, if dest has a custom toString() method,
				// don't overwrite it with the toString() method that source inherited from Object.prototype
				s = source[name];
				if (!(name in dest) || (dest[name] !== s && (!(name in empty) || empty[name] !== s))) {
					dest[name] = copyFunc ? copyFunc(s) : s;
				}
			}

			return dest; // Object
		}

		/**
		 * Mix the properties from the source object into the destination object
		 *
		 * @param {Object} dest the object to copy properties to
		 * @param {Object} sources the objects to copy properties from.  May be 1 to N arguments, but not an Array.
		 * @return {Object} the destination object
		 */
		function mixin(dest, sources) {
			var i, l;

			if (!dest) { dest = {}; }
			for (i = 1, l = arguments.length; i < l; i += 1) {
				_mixin(dest, arguments[i]);
			}

			return dest; // Object
		}

		return mixin;

	});

}(
	typeof define === 'function' ? define : function (deps, factory) {
		module.exports = factory.apply(this, deps.map(require));
	}
	// Boilerplate for AMD and Node
));