const reducer = (state = {count: 0}, action) => { switch (action.type){ case 'INCREASE': return {count: state.count + 1}; case 'DECREASE': return {count: state.count - 1}; default: return state; } }

const actions = { increase: () => ({type: 'INCREASE'}), decrease: () => ({type: 'DECREASE'}) }

const store = createStore(reducer);

store.subscribe(() => console.log(store.getState()) );

store.dispatch(actions.increase()) // {count: 1} store.dispatch(actions.increase()) // {count: 2} store.dispatch(actions.increase()) // {count: 3}