Reducer

Reducer.kt

class CounterReducer: Reducer<CounterState> {
  override fun reduce(state: CounterState, action: Action): CounterState {
    return when (action) {
      CounterAction.INCREASE -> state.copy(number = state.number + 1)

      CounterAction.DECREASE -> state.copy(number = state.number - 1)

      else -> state
    }
  }
}