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Eli Geller 2019-04-09 12:41:07 -04:00
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1-js/11-async/03-promise-chaining/article.md
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# Promises chaining
Let's return to the problem mentioned in the chapter <info:callbacks>: we have a sequence of asynchronous tasks to be done one after another. For instance, loading scripts. How to code it well?
Let's return to the problem mentioned in the chapter <info:callbacks>: we have a sequence of asynchronous tasks to be done one after another. For instance, loading scripts. How can we code it well?
Promises provide a couple of recipes to do that.
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## Summary
If `.then` (or `catch/finally`, doesn't matter) handler returns a promise, the rest of the chain waits until it settles. When it does, its result (or error) is passed further.
If a `.then` (or `catch/finally`, doesn't matter) handler returns a promise, the rest of the chain waits until it settles. When it does, its result (or error) is passed further.
Here's a full picture: