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16 lines
503 B
TypeScript
16 lines
503 B
TypeScript
// @ts-nocheck
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import { useRef, useEffect } from 'react';
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// Hook
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export function usePrevious(value) {
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// The ref object is a generic container whose current property is mutable ...
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// ... and can hold any value, similar to an instance property on a class
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const ref = useRef();
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// Store current value in ref
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useEffect(() => {
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ref.current = value;
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}, [value]); // Only re-run if value changes
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// Return previous value (happens before update in useEffect above)
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return ref.current;
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} |