what is setinterval in react code example

Example: setinterval react

import React, { useState, useEffect } from 'react';

const IntervalExample = () => {
  const [seconds, setSeconds] = useState(0);

  useEffect(() => {
    const interval = setInterval(() => {
      setSeconds(seconds => seconds + 1);
    }, 1000);
    return () => clearInterval(interval);
  }, []);

  return (
    <div className="App">
      <header className="App-header">
        {seconds} seconds have elapsed since mounting.
      </header>
    </div>
  );
};

export default IntervalExample;


//__________________________________________//
function Counter() {
  let [count, setCount] = useState(0);
  let [delay, setDelay] = useState(1000);

  useInterval(() => {
    // Your custom logic here
    setCount(count + 1);
  }, delay);

  function handleDelayChange(e) {
    setDelay(Number(e.target.value));
  }

  return (
    <>
      <h1>{count}</h1>
      <input value={delay} onChange={handleDelayChange} />
    </>
  );
}