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

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const state = store.getState();
// Logs 'x'
console.log(state); 

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store.dispatch(
  {
    type: 'CHARACTER_TYPED', 
    char: 'x'
  }
); 

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import { createStore } from 'redux';

// reducer is the reducer we defined earlier
const store = createStore(reducer);

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const reducer = (state = '', action) => { 
  switch (action.type) { 
      
    case 'CHARACTER_TYPED': 
      const { character } = action; 
      return state + character;
      
    case 'BACKSPACE':
      return state.substr(0, state.length - 1); 
    

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function (state, action) {
   // newState = Processing result of state and action
  return newState;
}

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function (a, b) {
  // c = Processing result of a and b
  return c;
};

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const insertCharacterActionCreator = (char) => {
  return {
      type: 'CHARACTER_TYPED',
      character: char
    }
};

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{
  type: 'CHARACTER_TYPED',
  character: 'x' 
}

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{
  type: 'BACKSPACE'
}