A Go(lang) translation of an old Codecademy project originally used to learn Python. Original Python version: https://gist.github.com/Rican7/5941418

go-version-of-codecademy-battleship.go

package main

import (
	"fmt"
	"math/rand"
	"strings"
	"time"
)

// Default configuration
var boardSize = 5
var maxTurns = 4

// Setup the game board
func setupBoard(size int) [][]string {
	// Set a default size
	if size <= 0 {
		size = boardSize
	}

	board := make([][]string, size)

	// Fill the board with size*size O's
	for i := 0; i < size; i++ {
		board[i] = make([]string, size)

		for idx := range board[i] {
			board[i][idx] = "O"
		}
	}

	return board
}

// Make it easier to print our board
func printBoard(board [][]string) {
	// Print an empty spacing line
	fmt.Println()

	for _, row := range board {
		fmt.Println(strings.Join(row, " "))
	}

	fmt.Println()
}

// Quick macro to generate a random integer
func randomInt(min, max int) int {
	r := rand.New(rand.NewSource(time.Now().UnixNano()))

	return r.Intn(max-min) + min
}

// Setup our enemy ship
func setupShip(board [][]string) []int {
	row := randomInt(0, len(board))
	col := randomInt(0, len(board[0]))

	return []int{row, col}
}

// Play the game!
func playGame(board [][]string, enemyShip []int, maxTurns int) bool {
	won := false

	for i := 0; i < maxTurns; i++ {
		printBoard(board)

		guess := [2]int{0, 0}

		// Get our guess
		fmt.Println("Guess the row: ")
		fmt.Scanf("%d", &guess[0])
		fmt.Println("Guess the column: ")
		fmt.Scanf("%d", &guess[1])

		fmt.Println()

		if guess[0] == enemyShip[0] && guess[1] == enemyShip[1] {
			fmt.Println("Congratulations! You sunk my battleship!")
			won = true
			break
		} else {
			switch {
			case (guess[0] < 0 || guess[0] > (len(board)-1)) || (guess[1] < 0 || guess[1] > (len(board[0])-1)):
				fmt.Println("Oops, that's not even in the ocean.")
			case board[guess[0]][guess[1]] == "X":
				fmt.Println("You guessed that one already.")
			default:
				fmt.Println("You missed my battleship!")
				board[guess[0]][guess[1]] = "X"
			}

			fmt.Println("Finished turn", (i + 1))
		}
	}

	return won
}

func main() {
	board := setupBoard(boardSize)
	ship := setupShip(board)

	fmt.Println("Let's play Battleship!")

	won := playGame(board, ship, maxTurns)

	if won {
		fmt.Println("Woot!")
	} else {
		fmt.Println("Sorry... Game over")
	}
}