ReactJS Program to Keyed Fragment List with Explanation
ReactJS
Hard
Component Design
19 views
1 min read
87 words
This problem helps you practice core ReactJS fundamentals in a practical way. It builds intuition around fragment, react, keyed. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Render a list where each item outputs two lines using a keyed Fragment.
Input Format
No input.
Output Format
Render a React component.
Constraints
Use React.Fragment with a key.
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
import React from 'react';
const lessons = [
{ id: 'l1', title: 'React basics', note: 'Components and props' },
{ id: 'l2', title: 'Hooks', note: 'State and effects' },
{ id: 'l3', title: 'Forms', note: 'Controlled inputs' }
];
export default function App() {
return (
<div style={{ padding: 16 }}>
{lessons.map((l) => (
<React.Fragment key={l.id}>
<strong>{l.title}</strong>
<div style={{ color: '#555', marginBottom: 10 }}>{l.note} on meetcode</div>
</React.Fragment>
))}
</div>
);
}
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 list where each item outputs two lines using a keyed Fragment.
Input / Output
Output
Render a React component.
Constraints
Use React.Fragment with a key.
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).
Official Solution
import React from 'react';
const lessons = [
{ id: 'l1', title: 'React basics', note: 'Components and props' },
{ id: 'l2', title: 'Hooks', note: 'State and effects' },
{ id: 'l3', title: 'Forms', note: 'Controlled inputs' }
];
export default function App() {
return (
<div style={{ padding: 16 }}>
{lessons.map((l) => (
<React.Fragment key={l.id}>
<strong>{l.title}</strong>
<div style={{ color: '#555', marginBottom: 10 }}>{l.note} on meetcode</div>
</React.Fragment>
))}
</div>
);
}
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