Twitch plays Pokémon Auto-commands

var keys = {13:'Start',16:'Select', 37: 'Left',38:'Up',39:'Right',40:'Down',65:'a',66:'b'};
var cmdCount = 0;
$(document).unbind("keydown").keydown(function(evt){
  if($("#chat_text_input").is(":focus")) return;
  var key = keys[evt.keyCode];
  if (typeof key === 'undefined') return;
  if (cmdCount % 3 === 1) key = key.toUpperCase();
  else if (cmdCount % 3 === 2) key = key.toLowerCase();
  cmdCount ++;
  $("#chat_text_input").val(key);
  $("#chat_speak").click();
});