Sign in
Skip to solution
hardMachine Coding

Build a Chat UI

395 views
01

Understand the problem

Build a chat interface with message list, input and auto-scroll.

ReactAsyncUI
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 Chat UI in React

Mental model: A scrollable list of { id, from, text } messages plus a composer. Sending appends a user message and (here) a simulated reply. The one non-obvious piece is auto-scrolling to the newest message after each append — do it in an effect keyed on the message list, scrolling

Solution ready — 2 min read

Classified // press E to declassify

04

React solution

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

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

Join the discussion

Discussion (0)

Sign in to join the discussion.

No responses yet. Be the first to share what you think.

Transmission complete // awaiting log

KEEP THE
STREAK ALIVE.

Dossier 81 of 87 decoded in the Frontend Machine Coding track. One more won't hurt.

Back to track