10 Matching Annotations
- Oct 2020
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github.com github.com
- Aug 2020
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medium.com medium.com
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Think of useRef as a useState that does not trigger a re-rendering of our component.
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- Nov 2019
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stackoverflow.com stackoverflow.com
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useRef(new Map()).current
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- Sep 2019
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medium.com medium.com
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The equivalent ways in functional components using Hooks:In a state variable: useState or useReducer. Updates in state variables will cause a re-render of the component.In a ref: Equivalent to instance variables in class components. Mutating the .current property won’t cause a re-render.
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stackoverflow.com stackoverflow.com
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const isFirst = useRef(true)
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You can also create your own custom hook that uses the useRef hook to keep track of if it's the first time the effect is being run, so that you can skip the first invocation.
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stackoverflow.com stackoverflow.com
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The useRef creates an "instance variable" in functional component.
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- Aug 2019
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stackoverflow.com stackoverflow.com
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const useFocus = () => { const htmlElRef = useRef(null) const setFocus = () => {htmlElRef.current && htmlElRef.current.focus()} return [ setFocus, htmlElRef ] }
exampleOf: useRef exampleOf: custom hook
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