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mediumMachine Coding

Build a Color Picker

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01

Understand the problem

Build a color picker with sliders/swatches and a live preview.

ReactUIEvents
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

Study the solution

Solve in

Building a Color Picker in React

Mental model: A color picker keeps one source of truth — RGB channels — and derives the hex string from them. Sliders edit channels; preset swatches set all three at once; the hex is computed for display/copy. Keep it controlled so the parent owns the value.

Step 1 — RGB

Solution ready — 2 min read

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04

React solution

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

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

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Transmission complete // awaiting log

KEEP THE
STREAK ALIVE.

Dossier 21 of 87 decoded in the Frontend Machine Coding track. One more won't hurt.

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