gistfile1.txt

#!js

Object.prototype.p = function () {
	print(uneval(this));
	return this;
};

function merge (a, b) {
	var ret = new Array(a.length + b.length);
	a = a.concat(Infinity); // clone the array and append sentry
	b = b.concat(Infinity);
	for (var i = 0, len = ret.length; i < len; i++) {
		ret[i] = (a[0] < b[0]) ? a.shift() : b.shift();
	}
	return ret;
}


//function merge_sort (list) {
//	var a = list.slice(0, list.length / 2);
//	var b = list.slice(list.length / 2);
//	({a:a, b:b}).p();
//	if (list.length > 2) {
//		return merge(merge_sort(a), merge_sort(b))
//	} else {
//		return merge(a, b);
//	}
//}

function merge_sort (list, begin, end) {
	[begin, end, list.slice(begin, end + 1)].p();

	if (end - begin > 0) {
		var middle = Math.floor((begin + end + 1) / 2);
		return merge(merge_sort(list, begin, middle - 1), merge_sort(list, middle, end))
	} else {
		return [ list[begin] ];
	}
}

var list = [1, 7, 9, 4, 3, 2, 6, 5, 8];

merge_sort(list, 0, list.length - 1).p();