title: Read Store's Initial State in Redux Reducer
body: <p>Initial state in a Redux app can be set in two ways:</p>
  
  <ul>
  <li>pass it as the second argument to <code>createStore</code> (<a href="http://redux.js.org/docs/api/createStore.html" rel="noreferrer">docs link</a>)</li>
  <li>pass it as the first argument to your (sub-)reducers (<a href="http://redux.js.org/docs/basics/Reducers.html" rel="noreferrer">docs link</a>)</li>
  </ul>
  
  <p>If you pass initial state to your store, how do you read that state from the store and make it the first argument in your reducers?</p>