simple js function to set up konami kode easter egg (up, up, down, down, left, right, left, right, b, a, enter)

konamicode.js

(function () {
  var buffer,
      latchId,
      onKonami,
      konamiChk,
      code = [38, 38, 40, 40, 37, 39, 37, 39, 66, 65];

  onKonami = function () {
    console.log("konami!!!");
  };

  konami = function (ev) { 
    buffer = buffer || code.slice();
    if (buffer[0] === ev.keyCode) {
      window.clearTimeout(latchId);
      buffer.splice(0, 1);
      if (buffer.length === 0) {
        onKonami();
      }
      latchId = window.setTimeout(function () {
        buffer = code.slice();
      }, 500);
    }
  };
  window.addEventListener("keyup", konami); 
}());