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easyMachine Coding

Build a Skeleton Loader

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01

Understand the problem

Build skeleton placeholders shown while content loads.

ReactLoadingUI
02

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03

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Building a Skeleton Loader in React

Mental model: A skeleton is a grey placeholder shaped like the content that's loading, with a moving shimmer to signal activity. Build one primitive <Skeleton> (width/height/radius props) and compose it into a card layout. Swap skeleton ↔ real content on a loading flag.

Solution ready — 2 min read

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04

React solution

Complete solutionRun Playground
import React, { useState, useEffect } from 'react';
import { Card, CardSkeleton } from './src/SkeletonLoader';

export default function App() {
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    const id = setTimeout(() => setLoading(false), 2000);
    return () => clearTimeout(id);
  }, [loading]);

  return (
    <div style={{ fontFamily: 'sans-serif', padding: 20 }}>
      <h1>Skeleton Loader Demo</h1>
      <button onClick={() => setLoading(true)} style={{ marginBottom: 16, padding: '6px 12px', cursor: 'pointer' }}>
        Reload
      </button>
      {loading ? <CardSkeleton /> : <Card />}
    </div>
  );
}
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Transmission complete // awaiting log

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Dossier 14 of 87 decoded in the Frontend Machine Coding track. One more won't hurt.

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