JS: Extending/merging one object with another.

extend.js

/**
 * An extend function to merge some default arguments
 * with those passed in from the user.
 *
 * @param  {object} obj    	The default settings
 * @param  {object} extObj 	Arguments from the user
 * @return {object}        	A merged object
 *
 */
var extend = function (obj, extObj) {
	if (arguments.length > 2) {
		var a = 1;
		for (a; a < arguments.length; a++) {
			extend(obj, arguments[a]);
		}
	} else {
		for (var i in extObj) {
			obj[i] = extObj[i];
		}
	}
	return obj;
}