A very simple console version of tictactoe implemented in dart

tictactoe-console.dart

import 'dart:io';

var cells = List.generate(3, (_) => [0, 0, 0]);
var player = 1;

void main(List<String> arguments) {
  printGameField();

  while (true) {
    print("Player $player's turn");
    var input = int.parse(stdin.readLineSync()) - 1;
    var row = (input / 3).floor();
    var col = (input % 3);

    if (cells[row][col] == 1 || cells[row][col] == 2) {
      print("That field is already taken");
      continue;
    }
    cells[row][col] = player;
    printGameField();

    if (isWinningMove(col, row)) {
      //Don't switch the players so the winner, because the winner should start the next round.
      print("Player $player has won the game! Restarting...");
      cells = List.generate(3, (_) => [0, 0, 0]);
    } else {
      if (isTie()) {
        print("It's a tie! Restarting...");
        cells = List.generate(3, (_) => [0, 0, 0]);
      }
      player = player == 1 ? 2 : 1;
    }
  }
}

bool isTie() {
  var tie = true;
  cells.forEach((r) => r.forEach((e) => e == 0 ? tie = false : {}));
  return tie;
}

bool isWinningMove(int col, int row) {
  return (cells[row][0] == player && cells[row][1] == player && cells[row][2] == player) ||
      (cells[0][col] == player && cells[1][col] == player && cells[2][col] == player) ||
      (row == col && cells[0][0] == player && cells[1][1] == player && cells[2][2] == player) ||
      (row + col == 2 && cells[0][2] == player && cells[1][1] == player && cells[2][0] == player);
}

void printGameField() {
  cells.forEach((r) {
    var line = "";
    r.forEach((f) => line += "$f ");
    print(line);
  });
  print(" ");
}