How do I add an element to array in reducer of React native redux?

Question

How do I add elements in my array arr[] of redux state in reducer? I am doing this-

import {ADD_ITEM} from \'../Actions/UserActions\'
const ini         


        

Answer 1

push does not return the array, but the length of it (docs), so what you are doing is replacing the array with its length, losing the only reference to it that you had. Try this:

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, action.newItem]
        }

        default:return state
     }
}