Master React Through Real-World Challenges

Write React and TypeScript in a full Monaco editor with IntelliSense, autocomplete, and optional Vim mode.

Run your code against a real Node + Jest server — the same setup you’d face in production and technical interviews.

Last challenges

#50
45min

File explorer

Build a recursive file explorer tree view with expandable and collapsible folders, similar to VS Code's sidebar.

ddd
useStaterecursion
#51
45min

Shopping cart with Redux

In this challenge, you'll create a simple shopping cart. The goal is to manage the cart's state globally using Redux Toolkit — allowing users to add, remove, and update products, as well as toggle the cart's visibility.

ddd
Redux
#52
30min

Use optimistic

Learn React's useOptimistic hook by building instant heart toggles that update the UI before the server responds — and revert automatically when requests fail.

ddd
useOptimisticstartTransitionreact 19

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Billed $60yearly
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  • 1Full access to 50+ challenges across all levels
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quarterly plan
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Billed $21quarterly
save 22%!
  • 1Full access to 50+ challenges across all levels
  • 2New challenges added every week
  • 3Exclusive advanced topics: Redux, React 19, compound components
  • 4View solutions and learn from working code
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  • 2All challenges include TypeScript and pre-styled layouts
  • 3Code editor with optional Vim mode
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