foreach

var foo = [1,2,3];
for(var i = 0; i < foo.length; i++){
	(function(el, i){ 
	
	})(foo[i], i, foo);
}

my.each = function(ar, fn, obj){
	for(var i = 0; i < ar.length; i++){
		fn.apply(obj || window, ar[i], i, ar);
	}
}
my.each(foo, function(el, i){
	
});

$.each([1,2,3], function(i){
	console.log(this == i - 1); // ugh
	console.log(i == 0); 
	console.log(arguments);
});