Redux.js

const reducer = ( state = [],action) => {
  if (action.type === 'split_string') {
      return action.payload.split('');
   }
   return state;
};

const store = Redux.createStore(reducer);

store.getState();

const action = {
  type: 'split_string',
  payload: 'AMCAT'
}; 

store.dispatch(action);

store.getState();