Sorting array of objects in javascript

array_sort.js

/*
* Using and overriding array's sort function
*/

var sort_by_age = function(arr, key, order="asc")
{ 
    return arr.sort(function(elem, elem2){
		result = (elem[key] < elem2[key]) ? -1 : (elem[key] > elem2[key] ? 1 : 0 );
        if(order == "asc")
        	return result;
		else if(order == "desc")
			return result * -1;
		else
			throw "order can be either 'asc' or 'desc'."
    });
};