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mediumMachine Coding

Build an Analog Clock

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01

Understand the problem

Build an analog clock with moving hour, minute and second hands.

ReactCanvasTimers
02

Attempt it yourself

Sketch your approach before reading the solution — that's what interviews test.

Nudge consolestandby

Stuck? Beam a request up — the console returns a conceptual nudge that guides your logic without spoiling the implementation.

03

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Solve in

Building an Analog Clock in React

Mental model: Read the current time on a 1-second interval, convert hours/minutes/seconds to rotation angles, and rotate three SVG hands. The only math is degrees-per-unit; SVG transform="rotate(deg cx cy)" does the rest. Clean up the interval on unmount.

Step 1 — Tick t

Solution ready — 2 min read

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04

React solution

Complete solutionRun Playground
import React from 'react';
import AnalogClock from './src/AnalogClock';

export default function App() {
  return (
    <div style={{ fontFamily: 'sans-serif', padding: 20 }}>
      <h1>Analog Clock Demo</h1>
      <AnalogClock />
    </div>
  );
}
05

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Transmission complete // awaiting log

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Dossier 43 of 87 decoded in the Frontend Machine Coding track. One more won't hurt.

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