Example finite state machine - credit: Nijiko Yonskai (https://github.com/Nijikokun)

finite_state_machine.js

function state (namespace) {
  if (!namespace) return internalState[internalState.length - 1]
  internalState.push([namespace, options])
  m.redirect(namespace, options)
}

function goto (namespace, options) {
  return function (e) {
    e.preventDefault()
    e.stopPropagation()
    state((typeof namespace === 'function' ? namespace() : namespace), options)
  }
}