title: How do I add an element to array in reducer of React native redux?
body: <p>How do I add elements in my array <code>arr[]</code> of redux state in reducer? 
  I am doing this-</p>
  
  <pre><code>import {ADD_ITEM} from '../Actions/UserActions'
  const initialUserState = {
      arr:[]
  }
  
  export default function userState(state = initialUserState, action)
  {
      console.log(arr);
      switch (action.type)
      {
          case ADD_ITEM: 
              return { 
                        ...state,
                        arr: state.arr.push([action.newItem])
                     }
  
          default:
              return state
      }
  }
  </code></pre>