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mediumMachine Coding

Build a Quiz App

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01

Understand the problem

Build a multiple-choice quiz with scoring and a results screen.

ReactQuizState
02

Attempt it yourself

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

Nudge consolestandby

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03

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Building a Quiz App in React

Mental model: A quiz walks an array of questions by index, recording the picked answer per question. Selecting locks in a choice and reveals correctness; Next advances; after the last question, show a score derived from the answers. Keep the answers in one array so the score and rev

Solution ready — 2 min read

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04

React solution

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

const questions = [
  { q: 'Which hook adds local state to a function component?', options: ['useEffect', 'useState', 'useMemo', 'useRef'], correct: 1 },
  { q: 'What does CSS stand for?', options: ['Cascading Style Sheets', 'Computer Style System', 'Creative Style Sheets', 'Colorful Style Sheets'], correct: 0 },
  { q: 'Which array method returns a new filtered array?', options: ['forEach', 'map', 'filter', 'reduce'], correct: 2 },
];

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

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