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hardMachine Coding

Build Connect Four

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01

Understand the problem

Build a 2-player Connect Four with win detection.

ReactGameAlgorithms
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 Connect Four in React

Mental model: A 6×7 grid where a disc dropped into a column falls to the lowest empty row. State is the grid plus the current player. The interesting part is the win check: from every filled cell, scan four directions for a run of four same-colour discs.

Step 1 — Grid + turn

Solution ready — 2 min read

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04

React solution

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

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

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Transmission complete // awaiting log

KEEP THE
STREAK ALIVE.

Dossier 71 of 87 decoded in the Frontend Machine Coding track. One more won't hurt.

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