Learning Redux

Rewriting the counter reducer

Now that we have defined the new state, let's rewrite the counter reducer.

1. We start by changing the default state--edit src/reducers/counter.js and replace the function with the following code:

const initialState = {  history: [0],  currentState: 0}export default function counterReducer (state = initialState, action) {

2. Then, we unwrap the state object:

  const { history, currentState } = state

3. We store the current count in a separate variable:

  const count = history[currentState]