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"Async is a utility module which provides straight-forward, powerful functions for working with asynchronous JavaScript. Although originally designed for use with node.js, it can also be used directly in the browser. Async provides around 20 functions that include the usual 'functional' suspects (map, reduce, filter, forEach…) as well as some common patterns for asynchronous control flow (parallel, series, waterfall…). All these functions assume you follow the node.js convention of providing a single callback as the last argument of your async function."

"I've quickly become a fan of jQuery's Deferred / Promise features. They've been around for a little bit now, but I only recent started using them and they've helped me solve a number of problems with my asynchronous JavaScript code. But what I recently figured out really blew my mind. You can use jQuery to support both synchronous and asynchronous code, with the `$.when` function, and your code doesn't have to care whether or not it's async."