React Online Test

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About the test

The React online test assesses knowledge of building web user interfaces with the React/ReactJS library through a series of live coding questions.

The assessment includes work-sample tasks such as:

  • Creating reusable Components.
  • Working with Hooks to access state and other React features.
  • Handling user events and updating the application based on user actions.

A good React/ReactJS developer should be able to work with the library effectively to create maintainable and accessible web user interfaces.

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>
7 min
Effect Hook
React Hooks
Reference Hook

Finish the FocusableInput component so that the input element automatically receives focus on the first render if the shouldFocus prop is true.

The component should use React Hooks.

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23 more premium React questions

Error Catcher, Login Form, Product Search, Pet Form, 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
  • Reducer Hook
  • Portals
  • Event Handling
  • Conditional Rendering
  • Content Manipulation
  • Managing State
  • Higher Order Components
  • Asynchronous Calls
  • Context
  • Data Binding

For job roles

  • JavaScript Developer
  • React Developer
  • Web Front-End Developer

Sample candidate report

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Simple, straight-forward technical testing

TestDome is simple, provides a reasonable (though not extensive) battery of tests to choose from, and doesn't take the candidate an inordinate amount of time. It also simulates working pressure with the time limits.

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Product reviews

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

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