Prepend to nameless array in Redux reducer

Prepend to nameless array in Redux reducer

By : Areeb
Date : November 18 2020, 03:01 PM
This might help you The state of the articleData reducer is an array. In the ARTICLE_POST_NEW_ARTICLE_SUCCESS action handler, you create a new state, which is an object, with an arr property - {arr:[action.articleData, ...state]}.
Instead return a new array with the new articleData, and spread the state into it:
code :
        return [action.articleData, ...state] 
export function articleData(state = [], action) {

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How can I use redux persist for only one reducer not for navigation reducer in my react native application?

How can I use redux persist for only one reducer not for navigation reducer in my react native application?

By : jkreuzig
Date : March 29 2020, 07:55 AM
this will help redux-persist v5
Set the blacklist/whitelist in the PersistConfig, and use it in persistCombineReducers (the 1st param):
code :
const persistConfig = {
  key: 'root',
  blacklist: ['navigation'],

const reducer = persistCombineReducers(persistConfig , reducers)
persistStore(store, { blacklist: ['navigation'] })
Redux reducer add new object to array

Redux reducer add new object to array

By : Digvijay Thakur
Date : March 29 2020, 07:55 AM
will be helpful for those in need I'm having a problem adding new object to array of objects through dispatching action after submit. The purpose of this is showing flash messages across site. I have two components that are responsible for showing messages, FlashMessagesList and FlashMessage. Also server respond with message object, that needs to bee added to messages array. The problem is when action is dispatched, I can see that it is dispatched in redux devtools, but state never changed no meter what i do, it remains empty array, and I'm quite stuck with this, so any advice will be welcome. Here is the relevant code: , There's a typo in your reducer. Instead of
code :
switch (action.types) {
switch (action.type) {
Redux dev tool state chart shows that reducer is updating another reducer

Redux dev tool state chart shows that reducer is updating another reducer

By : Travista
Date : March 29 2020, 07:55 AM
Any of those help All reducers get called when you dispatch any action, that is by design.
ACTION didn't attach to reducer despite state of reducer in react-redux

ACTION didn't attach to reducer despite state of reducer in react-redux

By : Saurabh Mehra
Date : March 29 2020, 07:55 AM
it should still fix some issue You need to have your action creators return functions that perform the asynchronous requests, right now your action creators only return objects, we can return functions using redux-thunk middleware
Then you would write your action creators that make api calls like this
code :
export const fetchThreadData = id => dispatch => {
    isLoading: true

  const request = axios({
    method: "GET",

  return request.then(
    response =>
        payload: response.data,
        isLoading: false
    error =>
        payload: error || "Failed to fetch thread",
        isLoading: false
How to update a value in 2D array in redux reducer?

How to update a value in 2D array in redux reducer?

By : fabio dias
Date : March 29 2020, 07:55 AM
This might help you I am trying to update a value at index (i, j) in a 2D array using spread operator in redux reducer. My reducer looks like: , Or without map at all, and just with spread operator and dynamic key:
code :
let arr = [
  [1, 2, 5],
  [5, 8, 9],
  [2, 6, 9]

const newValue = 6;
const i = 1;
const j = 2;

let myArr = Object.assign([...arr], {
  [i]: Object.assign([...arr[i]], {
    [j]: newValue

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