useDebounce

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A hook that allows to run a function after a specified delay.

This hook requires the following hooks: useTimeoutFn

Example

Demo Code

import { useState } from "react";
import useDebounce from "@/hooks/useDebounce";

export default function UseDebounceExample() {
  const [value, setValue] = useState("");
  const [debouncedValue, setDebouncedValue] = useState("");

  const debounced = () => {
    setDebouncedValue(value);
  };

  const [isReady, cancel] = useDebounce(debounced, 1000, [value]);

  return (
    <div className="flex flex-col items-center justify-center gap-4 p-4 text-ctp-text">
      <p>The input value will be debounced after 1 second. </p>
      <p>Use the cancel button to cancel the debounced function.</p>
      <p>Is ready: {isReady() ? "Yes" : "No"}</p>
      <p>
        isReady will return true if the function has been called within the
        specified delay, or null if the delay has not yet started.
      </p>
      <input
        className="rounded bg-ctp-surface1 p-2"
        value={value}
        onChange={(e) => setValue(e.target.value)}
        placeholder="Type something..."
      />
      <button
        className="rounded bg-ctp-blue px-4 py-2 text-ctp-base"
        onClick={() => cancel()}
      >
        Cancel
      </button>
      <p>Debounced value: {debouncedValue}</p>
    </div>
  );
}

Code

import { useEffect } from "react";
import type { DependencyList } from "react";
import useTimeoutFn from "./useTimeoutFn";

export type UseDebounceReturn = [() => boolean | null, () => void];

/**
 * A hook that allows to run a function after a specified delay.
 * @param {Function} fn - The function to run.
 * @param {number} ms - The delay in milliseconds.
 * @param {DependencyList} deps - An array of dependencies that will cause the function to be debounced.
 * @requires ./useTimeoutFn
 * @returns {UseDebounceReturn} An array containing two functions:
 * 1. isReady - A function that returns true if the function has been called within the specified delay, or null if the delay has not yet started.
 * 2. cancel - A function to cancel the debounced function.
 */
export default function useDebounce(
  fn: Function,
  ms: number = 0,
  deps: DependencyList = [],
): UseDebounceReturn {
  const [isReady, cancel, reset] = useTimeoutFn(fn, ms);

  useEffect(reset, deps);

  return [isReady, cancel];
}