My Implementation of the Debounce Function

debounce.js

function debounce(callback, interval) {
  let invokedFlag = false;
  let timer;

  const setInvokedFlag = () =>
    setTimeout(() => (invokedFlag = false), interval);

  return () => {
    if (invokedFlag) {
      clearTimeout(timer);
      timer = setInvokedFlag();
      return;
    }

    invokedFlag = true;
    timer = setInvokedFlag();
    return callback();
  };
}

// UNCOMMENT THESE TO TEST YOUR WORK!
function giveHi() {
  return "hi";
}
const giveHiSometimes = debounce(giveHi, 3000);
console.log(giveHiSometimes()); // -> 'hi'
setTimeout(function () {
  console.log(giveHiSometimes());
}, 2000); // -> undefined
setTimeout(function () {
  console.log(giveHiSometimes());
}, 4000); // -> undefined
setTimeout(function () {
  console.log(giveHiSometimes());
}, 8000); // -> 'hi'