Mid-Level
August 19, 2026Spot the bug: React / Next.js
One snippet. Find the bug, or prove there isn't one.
tsx
1import { useState } from 'react'
2
3function Stepper() {
4 const [count, setCount] = useState(0)
5
6 const incrementBy3 = () => {
7 setCount(count + 1)
8 setCount(count + 1)
9 setCount(count + 1)
10 }
11
12 return (
13 <div>
14 <p>Count: {count}</p>
15 <button onClick={incrementBy3}>+3</button>
16 </div>
17 )
18}Click the lines that carry the problem.
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