A Dart(lang) translation of an old Codecademy project originally used to learn Python. PS: Dart's pretty boss. Original Python version: https://gist.github.com/Rican7/5941418

dart-version-of-codecademy-battleship.dart

import "dart:math";
import "dart:io";

// Declare our game variables
List board;
Random randomizer;
int numOfRows = 5;
int numOfCols = 5;
int shipRow;
int shipCol;
int numOfTurns = 4;

/// Setup our board
setupBoard(List board, int numOfRows, int numOfCols) {
    // Setup our board by filling it with [numOfRows] rows
    var board = new List<List>.generate(numOfRows, (int index) {
        // Create a list with a [numOfCols] of "O" characters
        return new List<string>.filled(numOfCols, "O");
    });

    return board;
}

/// Print our board
printBoard(List board) {
    print("");

    for (var row in board) {
        print(row.join(" "));
    }

    print("");
}

/// Play the game
playGame(List board, int shipRow, int shipCol, int numOfTurns) {
    for (var turn = 0; turn < numOfTurns; turn++) {
        // Print the board
        printBoard(board);

        // Get the guess row
        print("Guess row: ");
        var guessRow = int.parse(stdin.readLineSync());

        // Get the guess col
        print("Guess col: ");
        var guessCol = int.parse(stdin.readLineSync());

        print("");

        if (guessRow == shipRow && guessCol == shipCol) {
            print("Congratulations! You sunk my battleship!");
            break;

        } else {
            if ((guessRow < 0 || guessRow > (board.length - 1)) ||
                (guessCol < 0 || guessCol > (board.first.length - 1))) {

                print("Oops, that's not even in the ocean.");

            } else if (board[guessRow][guessCol] == "X") {
                print("You guessed that one already.");
            } else {
                print("You missed my battleship!");
                board[guessRow][guessCol] = "X";
            }
        }

        print("Finished turn ${turn + 1}");
    }

    print("Game Over");
}

/// Main program entry
main() {
    // Setup our board
    board = setupBoard(board, numOfRows, numOfCols);

    randomizer = new Random();

    // Create our target ship"s points
    shipRow = randomizer.nextInt(board.length);
    shipCol = randomizer.nextInt(board[0].length);

    // Herrro!
    print("Let's play Battleship!");

    playGame(board, shipRow, shipCol, numOfTurns);
}