// create matcher functions
var leftKey    = keychord('left')
var ctrlA      = keychord('ctrl-a')
var ctrlShiftA = keychord('ctrl-shift-a')

document.addEventListener('keydown', function(event) {
  if (leftKey(event)) {
    console.log('left')
  } else if (ctrlA(event)) {
    console.log('ctrl-a')
  } else if (ctrlShiftA(event)) {
    console.log('ctrl-shift-a')
  }
})