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easyMachine Coding

Build a Like Button

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01

Understand the problem

Build an animated like button with optimistic count.

ReactStateAnimation
02

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Nudge consolestandby

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03

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Building a Like Button in React

Mental model: A like button toggles a boolean and adjusts a count. The interesting version is optimistic: flip the UI immediately, fire the request, and roll back if it fails. Derive the displayed count from a base count plus the local liked state so the two never disagree.

Solution ready — 2 min read

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04

React solution

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

export default function App() {
  return (
    <div style={{ fontFamily: 'sans-serif', padding: 20 }}>
      <h1>Like Button Demo</h1>
      <LikeButton initialCount={42} />
    </div>
  );
}
05

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Transmission complete // awaiting log

KEEP THE
STREAK ALIVE.

Dossier 5 of 87 decoded in the Frontend Machine Coding track. One more won't hurt.

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