[JavaScript] Debounce

debounce.js

function debounce(func, wait, immediate) {
  let timeout = null;
  return function () {
    let context = this;
    let args = arguments;
    const later = function () {
      timeout = null;
      if (!immediate) func.apply(context, args);
    }
    const callNow = immediate && !timeout;
    if (timeout) {
      clearTimeout(timeout)
    }
    timeout = setTimeout(later, wait);
    if (callNow) func.apply(context, args);
  }
}
// Example
// const handleScroll = debounce(() => console.log(new Date()), 200)