ife-vd-counter2-update.js

const resetAction = {type: counter.actions.INIT, data: 0};

function update(model, action) {
  return  action.type === RESET     ?
            { 
              first : counter.update(model.first, resetAction),
              second: counter.update(model.second, resetAction)
            }
            
        : action.type === UPDATE_FIRST   ?
            {...model, first : counter.update(model.first, action.data) }
            
        : action.type === UPDATE_SECOND  ?
            {...model, second : counter.update(model.second, action.data) }
            
        : model;
}

export default { view, update, actions : { UPDATE_FIRST, UPDATE_SECOND, RESET } }