January 2018
Intermediate to advanced
336 pages
7h 22m
English
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Emulating Synchronous Style with async and await
One of the most powerful new features in Node.js 8 is the introduction of async functions. Part of the 2017 ECMAScript draft specification, async functions allow you reap the benefits of Promises for simplifying code flow while structuring your code in a more natural way.
The key is that unlike a regular function, which always runs to completion, an async function can be intentionally suspended midexecution to wait on the resolution of a Promise. Note that this does not violate the central maxim that JavaScript is single-threaded. It’s not that some other code will preempt your async function, but rather that you choose to unblock the event loop to await a Promise.
An example should clarify. Consider ...
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