2048 button masher to show how artless the game is

2048_masher.js

// This script just mashes Up and Left until its stuck, and then it presses Right. Plays decently, which is the sad part.
//
// tested on https://2048game.com/
// To use this just go to that page, open dev tools, and paste this JS in the console.  Refresh the page to stop it.

const simulateKeyPress = (keyCode) => {
  document.dispatchEvent(new KeyboardEvent('keydown', { keyCode, which: keyCode }));
};

const upArrowKeyCode = 38, leftArrowKeyCode = 37, rightArrowKeyCode = 39;
let toggle = true, hashCheckCount = 0, lastHash = hashDOM();

// chattyg wrote this
function hashDOM() {
  const str = document.documentElement.innerHTML;
  let hash = 0;
  for (let i = 0; i < str.length; i++) {
    hash = (hash << 5) - hash + str.charCodeAt(i) | 0;
  }
  return hash;
}

let looper = setInterval(() => {
  // alterntaively mash between Up and Left
  simulateKeyPress(toggle ? upArrowKeyCode : leftArrowKeyCode);
  toggle = !toggle;

  const currentHash = hashDOM();
  // If the DOM hash isn't changing, then we're stuck and its time to press the Right key
  if (currentHash === lastHash) {
    if (++hashCheckCount === 3) {
      simulateKeyPress(rightArrowKeyCode);
      simulateKeyPress(leftArrowKeyCode);
      hashCheckCount = 0;
    }
  } else {
    hashCheckCount = 0;
    lastHash = currentHash;
  }
}, 20);