ReactJS Program to List Rendering With Stable Keys with Explanation
ReactJS
Medium
Component Design
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1 min read
89 words
This problem helps you practice core ReactJS fundamentals in a practical way. It builds intuition around list, stable, keys. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Render a topic list and use stable keys instead of index.
Input Format
No input.
Output Format
Render a React component.
Constraints
Use key from data like id or slug.
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
import React from 'react';
const topics = [
{ id: 'html', name: 'HTML' },
{ id: 'css', name: 'CSS' },
{ id: 'react', name: 'React' }
];
export default function App() {
return (
<ul style={{ padding: 16 }}>
{topics.map((t) => (
<li key={t.id}>{t.name} on meetcode</li>
))}
</ul>
);
}
Output Example
No sample I/O is provided for this question.
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Solution Guide
Problem
Render a topic list and use stable keys instead of index.
Input / Output
Output
Render a React component.
Constraints
Use key from data like id or slug.
Details
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Difficulty
Medium
ReactJS
Official Solution
import React from 'react';
const topics = [
{ id: 'html', name: 'HTML' },
{ id: 'css', name: 'CSS' },
{ id: 'react', name: 'React' }
];
export default function App() {
return (
<ul style={{ padding: 16 }}>
{topics.map((t) => (
<li key={t.id}>{t.name} on meetcode</li>
))}
</ul>
);
}
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