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mediumMachine Coding

Build Tic-Tac-Toe

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01

Understand the problem

Build a 2-player tic-tac-toe with win detection.

ReactGameState
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 Tic-Tac-Toe in React

Mental model: The whole game is one array of 9 cells plus whose turn it is. Everything else — winner, draw, whether a cell is clickable — is derived from that board. Clicks are ignored if the cell is taken or the game is over.

Step 1 — Board + turn

const [board, setBo

Solution ready — 2 min read

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04

React solution

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

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

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