How to add obj to to state in my example Redux React

How to add obj to to state in my example Redux React

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How to add obj to to state in my example Redux React
Tag : javascript , By : Sid
Date : January 12 2021, 09:11 PM

Does that help I have a problem with adding obj to my arr in redux store. , Use find to check if your array has an object with the same id:
  const found = state.selectedCountries.find(country => country.id === payload.id);

  return found ? state : {
    selectedCountries: [...state.selectedCountries, payload]

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React/Redux - Do I store mapped values of Redux items in Redux or Component state?

Tag : reactjs , By : lhoBas
Date : March 29 2020, 07:55 AM
this one helps. As accumulated value will change as more transactions are added, you should recalculate it on each store update and as updating stores should re-render your component, you should probably calculate it in render function of your component.
Check out Best Practices for Component State in React.js

How can i assign the redux state to react state while the redux state change in React-Redux?

Tag : javascript , By : Ben Humphrys
Date : March 29 2020, 07:55 AM
To fix the issue you can do You could use componentWillReceiveProps handler.
componentWillReceiveProps(nextPropsFromRedux) {
  this.setState({ somethingFrom: nextPropsFromRedux.property})

Redux in React Native without React Navigation state in Redux

Tag : reactjs , By : user158193
Date : March 29 2020, 07:55 AM
may help you . It’s not necessary to store navigation state in reducer. If you don’t need that just keep the app state in reducer and navigation state on its own. Then you can integrate Redux like this:
// App.js

import React from 'react';
import { Provider } from 'react-redux'
import RootNavigator from './src/navigation/RootNavigation';
import configureStore from './src/stores/configureStore';

const store = configureStore();

export default class App extends React.Component {
  render() {
    return (
      <Provider store={store}>
        <RootNavigator />
// navigation/RootNavigator.js

const HomeScreen = () => (
  <View style={{ flex: 1, alignItems: 'center', justifyContent: 'center' }}>
    <Text>Home Screen</Text>

const RootNavigator = StackNavigator({
  Home: {
    screen: HomeScreen,

export default RootNavigator;
 // reducers/navReducer.js

import RootNavigator from '../navigation/RootNavigation';

const initialState = RootNavigator.router.getStateForAction(RootNavigator.router.getActionForPathAndParams('Home'));

const navReducer = (state = initialState, action) => {
  const nextState = RootNavigator.router.getStateForAction(action, state);

  // Simply return the original `state` if `nextState` is null or undefined.
  return nextState || state;
// reducers/index.js

Import navReducer from ‘./navReducer’;

const appReducer = combineReducers({
  nav: navReducer,// updated was nav:nav,
import React from 'react';
import { Provider, connect } from 'react-redux';
import { addNavigationHelpers } from 'react-navigation';
import RootNavigator from './src/navigation/RootNavigation';
import configureStore from './src/stores/configureStore';
const store = configureStore();

class AppComponent extends React.Component {
  render() {
    return (
      <RootNavigator navigation={addNavigationHelpers({
        dispatch: this.props.dispatch,
        state: this.props.nav,
      })} />

const mapStateToProps = (state) => ({
  nav: state.navReducer

const AppContainer = connect(mapStateToProps)(AppComponent);

export default () => {
  return (
    <Provider store={store}>
      <AppContainer />

Retrieving a Redux state, but also change another Redux state in same React Native component?

Tag : reactjs , By : user87752
Date : March 29 2020, 07:55 AM
will be helpful for those in need Hm, looks like I asked too early. I did a bit of reading and the parameters in connect() actually accepts both.
So like this:
connect(mapStateToProps, mapDispatchToProps)(MyComponent)

React Native What is the fastest way of rendering view among using react state and redux state?

Tag : reactjs , By : sadboy
Date : March 29 2020, 07:55 AM
I hope this helps you . I would load the props before I even get to the view. Let's say you need the data on page B to get to page B you need to click a button on page A.
When page A is loaded, you request the data needed for page B. When navigating to page B you simply pass the properties via a router and you have them available from start in page B component.
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