React Redux Online Test

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About the test

The React Redux online test uses live coding tasks to assess the skills required to build front-end applications with React and manage the application’s state with the Redux Toolkit.

The assessment involves solving work sample tasks such as:

  • Creating reusable Components.
  • Handling user events and updating the application based on user actions.
  • Creating a store, reducers, and dispatching actions in Redux Toolkit.

A good React developer using the Redux Toolkit needs a solid understanding of both libraries to build and maintain complex front-end applications.

Sample public questions

20 min
Managing State
React Hooks

You have a GroceryApp component, which receives a list of products, each one with name and votes. The app should render an unordered list, with a list item for each product. Products can be upvoted or downvoted.

By appropriately using React state and props, implement the upvote/downvote logic. Keep the state in the topmost component, while the Product component should accept props.

For example, passing the following array as products prop to GroceryApp [{ name: "Oranges", votes: 0 }, { name: "Bananas", votes: 0 }] and clicking the '+' button next to the Oranges should result in HTML like:

<div id="root">
      <span>Oranges</span> - <span>votes: 1</span><button>+</button> <button>-</button>
      <span>Bananas</span> - <span>votes: 0</span><button>+</button> <button>-</button>
5 min
Redux Toolkit
Redux Actions
Redux Reducer
Redux Store

 Consider the following Redux reducer defined to manage a wish list:

const wishListReducer = createReducer(initialState, (builder) => {
    .addCase(removeItem, (state, action) => {
      state.wishList = state.wishList.filter((item => item !== action.payload))
    .addCase(addItem, (state, action) => {
      if(state.wishList.length < 10) {
    .addDefaultCase((state, action) => {});

const store = configureStore({
  reducer: {
    cart: wishListReducer,

The initial wish list:

const initialState = {
  wishList: [
    "Toy Car",

Considering the initalState and wishListReducer defined above, what is true about wishListReducer?

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25 more premium React Redux questions

Error Catcher, Login Form, Product Search, Pet Form, Music Playlist, Fruit Cart, Simple Calculator, Tooltip Component, Reorder, Player Status, Subscription, Post Comment, Shopping List, Cards Widget, List Wrapper, Async Paragraph, Contact Form, Theme Context Switcher, Email Form, Tab Strip, Toggle Options Visibility, Email Input, Details, Product Rating, Click Button.

Skills and topics tested

  • React
  • Components
  • Error Boundaries
  • Hooks
  • State Hook
  • Effect Hook
  • Forms
  • React Hooks
  • Redux Toolkit
  • Redux Actions
  • Redux Middleware
  • Redux Reducer
  • Redux Store
  • Reducer Hook
  • Portals
  • Event Handling
  • Conditional Rendering
  • Content Manipulation
  • Managing State
  • Higher Order Components
  • Asynchronous Calls
  • Context
  • Data Binding

For job roles

  • React Developer
  • Redux Toolkit Developer

Sample candidate report

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Product reviews

G2 - Crowd Badge
G2 - High Performer (2022)
Capterra - 4.5 Stars
Capterra - Shortlist (2022)

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