useInterval

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React hook that calls a function at a specified interval

Example

Demo Code

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

export default function UseIntervalExample() {
  const [count, setCount] = useState(0);

  useInterval(() => {
    setCount(count + 1);
  }, 1000);

  return <div className="text-ctp-text">Rendered every second: {count}</div>;
}

Code

import { useEffect, useRef } from "react";

/**
 * React hook that calls a function at a specified interval
 * @param {Function} callback - function to call
 * @param {number} delay - interval in milliseconds
 */
const useInterval = (callback: Function, delay?: number | null) => {
  const savedCallback = useRef<Function>(() => {});

  useEffect(() => {
    savedCallback.current = callback;
  });

  useEffect(() => {
    if (delay !== null) {
      const interval = setInterval(() => savedCallback.current(), delay || 0);
      return () => clearInterval(interval);
    }

    return undefined;
  }, [delay]);
};

export default useInterval;