Newspeak3
'Root'
class CounterUI usingPlatform: p  = (
	|
	private Subject = p hopscotch Subject.
	private Presenter = p hopscotch Presenter.
	|
) (
public class Counter = (
	| public count <Integer> ::= 0. |
) (
) : (
)
class CounterPresenter onSubject: s <CounterSubject> = Presenter  onSubject: s(
) (
definition = (
  ^row: {
      label: subject count. 
      mediumBlank. 
      button: 'increment' action: [updateGUI: [subject increment]].
      button: 'decrement' action: [updateGUI: [subject decrement]].
       button: 'reset' action: [updateGUI: [subject clear]].     
      }.
)
public isKindOfCounterPresenter = (
  ^true
)
isMyKind: other = (
  ^other isKindOfCounterPresenter
)
) : (
)
public class CounterSubject onModel: m <Counter> =  Subject onModel: m(
) (
createPresenter ^ <CounterPresenter> = (
  ^CounterPresenter onSubject: self
)
public isKindOfCounterSubject = (
  ^true
)
isMyKind: other = (
  ^other isKindOfCounterSubject
)
public decrement = (
  model count: count - 1
)
public increment = (
  model count: count + 1
)
public count ^ <Integer> = (
  ^model count
)
public clear = (
  model count: 0
)
) : (
)
) : (
)