Summary

In this chapter, we learned how to use promises and async/await syntax to write asynchronous code that is more concise, cleaner, and easier to read.

As we’ve seen, promises and async/await greatly simplify the serial execution flow, which is the most commonly used control flow. In fact, with async/await, writing a sequence of asynchronous operations is almost as easy as writing synchronous code. Running some asynchronous operations concurrently is also very easy thanks to Promise.all() and Promise.allSettled().

But the advantages of using promises and async/await don’t stop here. We learned that they provide a transparent shield against tricky situations such as code with mixed synchronous/asynchronous behavior (a.k.a. Zalgo, which we discussed in Chapter 3, Callbacks and Events). On top of that, error management with promises and async/await is much more intuitive and leaves less room for mistakes (such as forgetting to forward errors, which is a serious...