ReactJS Program to Conditional Banner with Explanation
ReactJS
Easy
Component Design
21 views
1 min read
84 words
This problem helps you practice core ReactJS fundamentals in a practical way. It builds intuition around conditional, banner, react. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Show a success banner only when a boolean prop is true.
Input Format
No input.
Output Format
Render a React component.
Constraints
Use conditional rendering, not CSS hiding.
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
import React from 'react';
export function Banner({ show, message }) {
if (!show) return null;
return (
<div style={{ padding: 12, borderRadius: 12, background: '#eafaf1', border: '1px solid #b7f0d0' }}>
{message}
</div>
);
}
export default function App() {
return <Banner show={true} message='Saved on meetcode.' />;
}
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
Show a success banner only when a boolean prop is true.
Input / Output
Output
Render a React component.
Constraints
Use conditional rendering, not CSS hiding.
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';
export function Banner({ show, message }) {
if (!show) return null;
return (
<div style={{ padding: 12, borderRadius: 12, background: '#eafaf1', border: '1px solid #b7f0d0' }}>
{message}
</div>
);
}
export default function App() {
return <Banner show={true} message='Saved on meetcode.' />;
}
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