Hands-on challenges
Sharpen your skills on real React tasks in a live editor with tests — the kind of reps that actually move the needle.
Real coding challenges in a live editor, plus flashcards and system-design prep — everything you need to sharpen your React and get the offer.
import { useState } from "react";
export default function Counter() {
const [count, setCount] = useState(0);
return (
<div className="counter">
<button onClick={() => setCount(count - 1)}>−</button>
<output>{count}</output>
<button onClick={() => setCount(count + 1)}>+</button>
</div>
);
}Why ReactPrep
Sharpen your skills on real React tasks in a live editor with tests — the kind of reps that actually move the needle.
Understand the how and the why behind every solution, so the patterns stick long after you close the tab.
Save your work, watch your streak grow, and focus on the topics where you have the most to gain.
Jump into the challenges, flashcards, and system-design walkthroughs. Start free, and unlock everything whenever you’re ready.