Redux : Store

redux_store.js

// Dependency : http://redux.js.org/
const { createStore } = Redux;

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

const persistedState = 5;
// Creating and passing reducer to store. 
const store = createStore(counter, persistedState); //passing persistedState as second argument to store.

const render = () => {
   // Get state returns the state of application
   document.body.innerText = store.getState();
}

store.subscribe(render);
render();


document.addEventListener('click', () => {
  // Dispactching action
  store.dispatch({type: 'INCREMENT'});
} );