function intent(domSources) {
  return domSources.select('.field').events('input')
  .map(ev => ev.target.value)
}

function model(action) {
  return action.map(inputValue => inputValue).startWith(‘’)
}

function view(state$) {
  return state$.map(state =>(div([‘Twój stan aplikacji: ’ + state]))
}

function main(sources) {
  const action = intent(sources.DOM)
  const state$ = model(action)
  const vdom$ = view(state$)
  return { DOM: vdom$ }
}