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Dan Abramov
2022-02-04 21:12:13 +00:00
parent b06f63219c
commit 77af71e359
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beta/src/pages/apis/usestate.md
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@@ -856,4 +856,4 @@ button { margin-bottom: 10px; }
Note that derived state must set be inside a condition like `prevCount !== count`, and there must be a call like `setPrevCount(count)` inside of it. Otherwise, your component would re-render in a loop until it crashes.
If you can, try to avoid derived state. However, derived state is better than updating state in an effect. When you call the `set` function during render, React will render that component immediately after your component exits with a `return` statement. React will ignore the initial output so it won't need to render the children twice.
If you can, try to avoid derived state. However, derived state is better than updating state in an effect. When you call the `set` function during render, React will re-render that component immediately after your component exits with a `return` statement, and before rendering the children. This way, children don't need to render twice.