ReactJS Program to Avatar With Fallback with Explanation
ReactJS
Medium
Component Design
26 views
1 min read
91 words
This problem helps you practice core ReactJS fundamentals in a practical way. It builds intuition around image, avatar, react. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Create an Avatar that shows an image, but falls back to initials if image is missing.
Input Format
No input.
Output Format
Render a React component.
Constraints
Handle image error state inside the component.
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
import React, { useState } from 'react';
export function Avatar({ name, src, size = 56 }) {
const [broken, setBroken] = useState(false);
const initials = name
.split(' ')
.filter(Boolean)
.slice(0, 2)
.map((part) => part[0].toUpperCase())
.join('');
const common = {
width: size,
height: size,
borderRadius: '50%',
display: 'grid',
placeItems: 'center',
fontWeight: 700,
background: '#0b5',
color: '#fff'
};
if (!src || broken) {
return <div style={common} aria-label={name}>{initials}</div>;
}
return (
<img
src={src}
alt={name}
width={size}
height={size}
style={{ ...common, objectFit: 'cover' }}
onError={() => setBroken(true)}
/>
);
}
export default function App() {
return (
<div style={{ display: 'flex', alignItems: 'center', gap: 12, padding: 16 }}>
<Avatar name='Meetcode Learner' src='' />
<div>
<strong>Meetcode Learner</strong>
<div style={{ color: '#555' }}>Practicing CSS</div>
</div>
</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
Create an Avatar that shows an image, but falls back to initials if image is missing.
Input / Output
Output
Render a React component.
Constraints
Handle image error state inside the component.
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, { useState } from 'react';
export function Avatar({ name, src, size = 56 }) {
const [broken, setBroken] = useState(false);
const initials = name
.split(' ')
.filter(Boolean)
.slice(0, 2)
.map((part) => part[0].toUpperCase())
.join('');
const common = {
width: size,
height: size,
borderRadius: '50%',
display: 'grid',
placeItems: 'center',
fontWeight: 700,
background: '#0b5',
color: '#fff'
};
if (!src || broken) {
return <div style={common} aria-label={name}>{initials}</div>;
}
return (
<img
src={src}
alt={name}
width={size}
height={size}
style={{ ...common, objectFit: 'cover' }}
onError={() => setBroken(true)}
/>
);
}
export default function App() {
return (
<div style={{ display: 'flex', alignItems: 'center', gap: 12, padding: 16 }}>
<Avatar name='Meetcode Learner' src='' />
<div>
<strong>Meetcode Learner</strong>
<div style={{ color: '#555' }}>Practicing CSS</div>
</div>
</div>
);
}
Solutions (0)
No solutions submitted yet. Be the first!
