sort a object by a objectkey

sort.js

/*
 * creator: Danj (https://github.com/DanBrothers)
 * description: sort a array by key values
 * license: MIT, please link to this if you copy (thanks)
 *
 * usage:
 	//returns a sorted array
 	sortby(array, {
 		desc: true,
 		prop: "name", 
		parser: functon(item) {
			return new
		}
	});
 */

function sortby(array, cfg) {
	if (!(array instanceof Array && array.length)) {
		return [];
	}
	
	if (!(cfg instanceof Object)) {
		cfg = {};
	}
	
	if (typeof cfg.parser !== "function") {
		cfg.parser = function (x) { return x; };
	}
	
	var getItem = function (x) {
		var isProp = x != null && typeof x === "object" && this.prop in x;
		return this.parser(isProp ? x[this.prop] : x);
	};
	
	cfg.desc = !!cfg.desc ? -1 : 1;
	return array.sort(function (a, b) {
		a = getItem(a);
		b = getItem (b);
		return cfg.desc * (a < b ? -1 : +(a > b));
	});
};