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function init() {
  return { first: counter.init(), second: counter.init() };
}

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function init() {
  return 0;
}

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function update(model, action) {
  
  return Action.case({
    Add     : () => addCounter(model),
    Remove  : id => removeCounter(model, id),
    Reset   : () => resetCounters(model), 
    Update  : (id, action) => updateCounter(model, id, action)
  }, action);
}

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const Action = Type({
  Add     : [],
  Remove  : [Number],
  Reset   : [],
  Update  : [Number, counter.Action],
});

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function update(count, action) {
  return  Action.case({
    Increment : () => count + 1,
    Decrement : () => count - 1
  }, action);
}

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function view(count, handler) { 
  return h('div', [
    h('button', {
      on   : { click: handler.bind(null, Action.Increment()) }
    }, '+'),
    h('button', {
      on   : { click: handler.bind(null, Action.Decrement()) }
    }, '-'),
    h('div', `Count : ${count}`),
  ]); 

yelouafi

import Type from 'union-type';

const Action = Type({
  Increment : [],
  Decrement : []
});

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function updateCounter(model, id, action) {
  return {...model,
    counters  : model.counters.map(item => 
      item.id !== id ? 
          item
        : { ...item, 
            counter : counter.update(item.counter, action)
          }
    )
  };

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function counterItemView(item, handler) {
  return h('div.counter-item', {key: item.id }, [
    h('button.remove', {
      on : { click: e => handler({ type: REMOVE, id: item.id})  }
    }, 'Remove'),
    counter.view(item.counter, a => handler({type: UPDATE, id: item.id, data: a})),
    h('hr')
  ]);
}

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//{ first : counter.model, second : counter.model }

const RESET         = Symbol('reset');
const UPDATE_FIRST  = Symbol('update first');
const UPDATE_SECOND = Symbol('update second');