First Redux app

my first redux app.js

const INCREMENT = 'INCREMENT', // Define a constant for increment action types
DECREMENT = 'DECREMENT', // Define a constant for decrement action types
MULTIPLY  = 'MULTIPLY',

DIVIDE    = 'DIVIDE';

const counterReducer = (state= 0, action) => {
    switch(action.type) {
        case INCREMENT :
            return state + 1
        case DECREMENT :
            return state - 1
        case MULTIPLY :
            return state * action.num
        case DIVIDE :
            return state / action.num
    }
}; // Define the counter reducer which will increment or decrement the state based on the action it receives

const incAction = () => ({type:INCREMENT}), // Define an action creator for incrementing

decAction = () => ({type: DECREMENT}), // Define an action creator for decrementing
multiplyAction = (n) => ({type: MULTIPLY, num : n}),

divideAction = (n) => ({type: DIVIDE, num:n});

const store = Redux.createStore(counterReducer); // Define the Redux store here, passing in your reducers
store.subscribe(() => console.log(store.getState()))

store.dispatch(decAction())
store.dispatch(incAction())
store.dispatch(incAction())
store.dispatch(incAction())
store.dispatch(multiplyAction(2))
store.dispatch(divideAction(2))