July 2016
Intermediate to advanced
526 pages
11h 42m
English
Content preview from Node.js Design Patterns - Second EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The async library
If we take a look for a moment at every control flow pattern we have analyzed so far, we can see that they could be used as a base to build reusable and more generic solutions. For example, we could wrap the unlimited parallel execution algorithm into a function which accepts a list of tasks, runs them in parallel, and invokes the given callback when all of them are complete. This way of wrapping control flow algorithms into reusable functions can lead to a more declarative and expressive way to define asynchronous control flows, and that's exactly what async (https://npmjs.org/package/async) does. The async library is a very popular solution, in Node.js and JavaScript in general, to deal with asynchronous code. It offers a set ...
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