Async composition

squash.js

// Pyramid of doom
function go(input) {
	// step 1
	doSomethingAsync(input, function (result) {
		// step 2
		doSomethingElse(result, function (result2) {
			// step 3
			doYetAnotherThing(result2, function (result3) {
				moveOnWithLife(result3);
			});
		});
	});
}

// Happyness
function go(input) {
	async.seq(
		function (initial, next) {
			// step 1
			doSomethingAsync(initial, function (result) {
				next(null, result);
			});
		},
		function (prevResult, next) {
			// step 2
			doSomethingElse(prevResult, function (result) {
				next(null, result);
			});
		},
		function (prevResult, next) {
			// step 3
			doYetAnotherThing(prevResult, function (result) {
				next(null, result);
			});
		}
	)(input, function (finalCountdown) {
		moveOnWithLife(finalCountdown);
	});
}