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Array.prototype.nSort = nSort;
// [].prototype.nSort works too

function nSort(){
	return this.sort(
		function numSort(n1, n2){
			if (n1 < n2) return -1;
			if (n1 > n2) return 1;
			return 0;
		}
	);
}

var numbers = [];
numbers[0] = 20;
numbers[1] = 22;
numbers[2] = 21;
numbers[3] = 19;

console.log(numbers.nSort())