Some typical asynchronous behavior

typical.js

function handleFoobar(error, foobar) {
	if(error) output(error);

	var bar = deFoo(foobar);
	// Matrix multiplication or something
	output(bar);
}

fooButton.on("click", function (evt) {
	$.get("/foobar/1", handleFoobar);
	$.get("/foobar/2", handleFoobar);
});

kittyButton.on("click", function(evt){
	$.ajax({
		type: "PUT",
		url: "/kitty/1337",
		data: { kitty: "Mustachio", what: "Got totes clicked." }
	}).then(function(updatedKitty) {
		writeLocal(updatedKitty);
	}, function (error) {
		output(error);
	});
});