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fix link to anchor #unsafe_componentwillupdate #920

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gaearon merged 1 commit into from
May 31, 2018
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fix link to anchor #unsafe_componentwillupdate #920

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2 changes: 1 addition & 1 deletion content/docs/reference-react-component.md
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Expand Up @@ -263,7 +263,7 @@ Use `shouldComponentUpdate()` to let React know if a component's output is not a

Returning `false` does not prevent child components from re-rendering when *their* state changes.

Currently, if `shouldComponentUpdate()` returns `false`, then [`UNSAFE_componentWillUpdate()`](#componentwillupdate), [`render()`](#render), and [`componentDidUpdate()`](#componentdidupdate) will not be invoked. Note that in the future React may treat `shouldComponentUpdate()` as a hint rather than a strict directive, and returning `false` may still result in a re-rendering of the component.
Currently, if `shouldComponentUpdate()` returns `false`, then [`UNSAFE_componentWillUpdate()`](#unsafe_componentwillupdate), [`render()`](#render), and [`componentDidUpdate()`](#componentdidupdate) will not be invoked. Note that in the future React may treat `shouldComponentUpdate()` as a hint rather than a strict directive, and returning `false` may still result in a re-rendering of the component.

If you determine a specific component is slow after profiling, you may change it to inherit from [`React.PureComponent`](/docs/react-api.html#reactpurecomponent) which implements `shouldComponentUpdate()` with a shallow prop and state comparison. If you are confident you want to write it by hand, you may compare `this.props` with `nextProps` and `this.state` with `nextState` and return `false` to tell React the update can be skipped.

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