A custom React Hook for a debounced click handler with a given callback and delay.

use-debounce.js

/*
 * Inspired by Dan Abramov's "Making setInterval Declarative with React Hooks",
 * this is a custom hook for debouncing a callback (e.g. for click handlers) such
 * that a callback will not be fired until some delay has passed since the last click.
 * The callback will automatically be updated with the latest props and state on every
 * render meaning that users don't need to worry about stale information being used.
 *
 * See https://overreacted.io/making-setinterval-declarative-with-react-hooks/ for the
 * original inspiration.
 */
import React, { useState, useEffect, useRef } from 'react';

const useDebounce = (callback, delay) => {
  const latestCallback = useRef();
  const latestTimeout = useRef();

  useEffect(() => {
    latestCallback.current = callback;
  }, [callback]);

  return () => {
    if (latestTimeout.current) {
      clearTimeout(latestTimeout.current);
    }

    latestTimeout.current = setTimeout(() => { latestCallback.current(); }, delay);
  };
};

const App = () => {
  const [count, setCount] = useState(0);

  const handleIncrement = () => setCount(count => count + 1);
  const handleClick = useDebounce(() => alert(`I've been clicked ${count} times`), 3000);

  return (
    <>
      <button onClick={handleClick}>Click</button>
      <button onClick={handleIncrement}>Increment {count}</button>
    </>
  );
}

export default App;

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