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 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

User · Answer

If you need to insert into a specific position in the array  you can do this   case ADD ITEM       return               state          arr                   state arr slice 0  action pos               action newItem                 state arr slice action pos

User · Answer

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

User · Answer

Two different options to add item to an array without mutation  case ADD ITEM       return               state          arr      state arr  action newItem          OR  case ADD ITEM       return               state          arr  state arr concat action newItem

User · Answer

I have a sample  import   as types from        helpers ActionTypes    var initialState       changedValues        const quickEdit    state   initialState  action    gt       switch  action type         case types PRODUCT QUICKEDIT                  const item   action item          const changedValues                  state changedValues             item id   item                      return                state            loading  true            changedValues  changedValues                         default                  return state                  export default quickEdit

[react-native] How do I add an element to array in reducer of React native redux?

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