Created
October 14, 2021 10:55
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usePrevious React Hook
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| import React, { useState } from "react"; | |
| import usePrevious from "./usePrevious"; | |
| const App = () => { | |
| const [count, setCount] = useState(0); | |
| const prevCount = usePrevious(count); | |
| return ( | |
| <> | |
| <p>Count: {count} - Previous Count: {prevCount || 0}</p> | |
| <button onClick={() => setCount(count + 1)}>Add</button> | |
| </> | |
| ); | |
| }; |
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| import { useEffect, useRef } from "react"; | |
| export default (value) => { | |
| const ref = useRef(); | |
| useEffect(() => { | |
| ref.current = value; | |
| }); | |
| return ref.current; | |
| }; |
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