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

Easy
20 min
code
Public
AI-resistant
React
Data Binding
React Hooks
State Hook

An RPG game lets you assign points to various attributes of your character to improve it. The points earned by the character are available to assign across all attributes. Each attribute can only be assigned at most 70% of totalPoints (rounded down to the nearest integer) unless totalPoints is 1, in which case only one attribute can get a maximum of 1 point. The sum of all points assigned plus the points remaining should add up to totalPoints.

Implement the CharacterAttributes component with the logic described above and the following requirements:

  • Points should be assigned by moving the slider and the remaining points should be displayed in the span tag.
  • When initialized, all points are available and all sliders start at 0.
  • Each slider must have a range from 0 up to totalPoints.

For example, if totalPoints is 15 then the user shouldn't be able to drag the slider past 10 even if more points are available.

Easy
5 min
mca
Public
Redux Toolkit
Redux Actions
Redux Reducer
Redux Store

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

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

const store = configureStore({
  reducer: {
    cart: wishListReducer,
  },
});

The initial wish list:

const initialState = {
  wishList: [
    "Toy Car",
    "Football"
  ],
};

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

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27 more premium React Redux questions

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

Skills and topics tested

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

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 (2023)

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