This is an ES6 utilities script.

utils.js

// refer to https://xingzhi.dev/blog/common-js-snippets/

/**
 * This function returns a UUID
 * Taken from from https://stackoverflow.com/a/8809472/6622966
 *
 * @return {string} A UUID in string
 *
 * @example
 */
function generateUUID() { // Public Domain/MIT
  var d = new Date().getTime();
  if (typeof performance !== 'undefined' && typeof performance.now === 'function') {
    d += performance.now(); //use high-precision timer if available
  }
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
    var r = (d + Math.random() * 16) % 16 | 0;
    d = Math.floor(d / 16);
    return (c === 'x' ? r : (r & 0x3 | 0x8)).toString(16);
  });
}

/**
 * This function throttles a function
 * https://gist.github.com/beaucharman/e46b8e4d03ef30480d7f4db5a78498ca
 * https://www.30secondsofcode.org/js/s/throttle
 *
 * @param {function} callback - The callback function to invoke
 * @param {number} wait - The number of milliseconds to wait before invoking the callback
 * @param {namespace} context - The namespace to invoke the callback
 */
function throttle(callback, wait, context = this) {
  let timeout = null
  let callbackArgs = null

  const later = () => {
    callback.apply(context, callbackArgs)
    timeout = null
  }

  return function () {
    if (!timeout) {
      callbackArgs = arguments
      timeout = setTimeout(later, wait)
    }
  }
}

/**
 * This function throttles a function
 * https://gist.github.com/beaucharman/1f93fdd7c72860736643d1ab274fee1a
 * https://www.30secondsofcode.org/js/s/debounce
 *
 * @param {function} callback - The callback function to invoke
 * @param {number} wait - The number of milliseconds to wait before invoking the callback
 * @param {boolean} immediate - Whether to invoke the function immediately
 */

function debounce(callback, wait, immediate = false) {
  let timeout = null

  return function () {
    const callNow = immediate && !timeout
    const next = () => callback.apply(this, arguments)

    clearTimeout(timeout)
    timeout = setTimeout(next, wait)

    if (callNow) {
      next()
    }
  }
}