an each implementation that caches unraveled loops

anti-loop.js

var each = (function () {
    function each(arr, fn) {
        var len = arr.length;
		return (each[len] || (each[len] = each.factory(len), each[len]))(arr, fn);
	}
	each.factory = function (len) {
		var body = "\tvar i = 0;\n";
		while (len--) {
			body += "\tfn(i, arr[i++]);\n";
		}
		body += "\treturn;\n";
		return Function("arr", "fn", body);
	};
	return each;
}());

each([1,2,3,4], function (i, e) {console.log(e + 1);});
//performs almost as fast as for loops in chrome
//fastest looper in IE: http://jsperf.com/jquery-each-vs-for-loop/162