New Free React Challenge: Countdown ⏱️

Published: (December 22, 2025 at 12:59 PM EST)
1 min read
Source: Dev.to

Source: Dev.to

Challenge Overview

Cover image for New Free React Challenge: Countdown ⏱️

Build a real countdown timer using useState and useEffect, and deal with state, side effects, and precise time updates.

Designed for beginners, but with the kind of edge cases you actually find in production.

  • Estimated time: 30 minutes
  • No tutorials: Just React.

Tags

  • #react
  • #javascript
  • #frontend
  • #frontendchallenge
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