daniel
Reputation: 334
How does Promises work when JavaScript is single threaded?
How does JavaScript execute Promises async when JS is single threaded? I know how to use Promises, but it is still unclear to me how it works behind the scene.
Upvotes: 3
Views: 842
Answers (1)
SeanCannon
Reputation: 77956
Promises are just a callback queue assigned to a lookup. Once you resolve the promise, it iterates over all callbacks which have been assigned via then or done.
Upvotes: 2
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