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mediumMachine Coding

Build a Poll / Voting widget

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01

Understand the problem

Build a poll where users vote and see live percentage bars.

ReactStateData
02

Attempt it yourself

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

Nudge consolestandby

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03

Study the solution

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Building a Poll / Voting Widget in React

Mental model: A poll is a list of options with vote counts plus a record of this user's vote. Voting increments the chosen option (and decrements the previous if they switch). Percentages are derived from the counts; results only reveal after voting.

Step 1 — Coun

Solution ready — 2 min read

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04

React solution

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

const options = [
  { label: 'React', votes: 42 },
  { label: 'Vue', votes: 28 },
  { label: 'Angular', votes: 19 },
  { label: 'Svelte', votes: 11 },
];

export default function App() {
  return (
    <div style={{ fontFamily: 'sans-serif', padding: 20 }}>
      <h1>Poll Demo</h1>
      <Poll question="Favorite framework?" options={options} />
    </div>
  );
}
05

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Transmission complete // awaiting log

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Dossier 44 of 87 decoded in the Frontend Machine Coding track. One more won't hurt.

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