cssAudio - Activefile-genericCSS - ActiveGeneric - ActiveHTML - ActiveImage - ActiveJS - ActiveSVG - ActiveText - Activefile-genericVideo - ActiveLovehtmlicon-new-collectionicon-personicon-teamlog-outoctocatpop-outspinnerstartv

Konami Code RxJS

A Pen By Captain Anonymous

Pen Settings

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

Quick-add: + add another resource

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

Quick-add: + add another resource

Code Indentation


Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

              // The famous sequence of input's representing the KONAMI cheat code.
var KONAMI_CODE = ['UP', 'UP', 'DOWN', 'DOWN', 'LEFT', 'RIGHT', 'LEFT', 'RIGHT', 'B', 'A'];

  Takes a KeyBoardEvent and returns either a KONAMI_CODE key
  or the value null.
  It will return a KONAMI_CODE key when the KeyBoardEvent's key
  matches a value in the KONAMI_CODE.
  It will return null when the key is not part of the KONAMI_CODE.
function eventToKonamiCode(event) {
  switch (event.which) {
    case 38: return 'UP';
    case 40: return 'DOWN';
    case 37: return 'LEFT';
    case 39: return 'RIGHT';
    case 66: return 'B';
    case 65: return 'A';
  return null;

  Checks if the codes paramater, which is an array, matches the KONAMI_CODE exactly.
function isKonamiCode(codes) {
  return _.isEqual(codes, KONAMI_CODE);

  Appends the 'code' parameter to the 'codes' parameter, if the
  code is the next part of the KONAMI_CODE sequence.
  If the code is not the next sequence of the KONAMI_CODE an
  empty array is returned.
function codeAccumulator(codes, code) {
  // Not a normal KONAMI_CODE key so return an empty array.
  if (code === null) {
    return [];

  // Check if 'codes' still matches the KONAMI_CODE.
  var subKonamiCode = _.take(KONAMI_CODE, codes.length);
  if (_.isEqual(codes, subKonamiCode)) {
    return codes;
  } else {
    return []; // No match back to square one.

var konamiStream = Rx.Observable.fromEvent(document, 'keydown')
  .scan(codeAccumulator, [])

var livesSpan = document.querySelector('span');

konamiStream.subscribe(function() {
  alert('You entered the Konami code!');
  livesSpan.textContent = '99';
Loading ..................