const createStore = (rootReducer, initialState) => {
    let state = rootReducer(initialState);
    const subsribers = [];
    const getSate = () => state
    const subscribe = cb => subsribers.push(cb);
    const dispatch = action => {
        state = rootReducer(state, action);
        subsribers.forEach(s => s());
    }
    return {
        dispatch,
        getSate,
        subscribe
    }

const initialCounter = 0;
const counterReducer = (state = initialCounter, action = '') => {
    switch (action.type) {
        case 'INCREMENT':
            return state + 1
        case 'DECREMENT':
            return state - 1
        default: return state
    }
}