When is setState asynchronous?

Posted by Prem Tiwari | Updated on

Currently, setState is asynchronous inside event handlers.

This ensures, for example, that if both Parent and Child call setState during a click event, Child isn’t re-rendered twice. Instead, React “flushes” the state updates at the end of the browser event. This results in significant performance improvements in larger apps.

This is an implementation detail so avoid relying on it directly. In the future versions, React will batch updates by default in more cases.


If you like this question & answer and want to contribute, then write your question & answer and email to freewebmentor[@]gmail.com. Your question and answer will appear on FreeWebMentor.com and help other developers.

Related Questions & Answers