simple_tic_tac_toe_engine

Initialisation

The object Oxo can take as input.

• nothing (will set an empty grid)
• a string of length 9 composed of 1, 2 or 3
• a 1D array of length 9 composed of 1, "1", 2, "2", "3" or 3
• a 2D of length 3x3 composed of 1, "1", 2, "2", "3" or 3

const Oxo = require("simple_tic_tac_toe_engine");

let oxo = new Oxo();

// by default the oxo grid is empty
let oxo1 = new Oxo();

/*
you can pass a string of 9 (0|1|2)
to the constructor to start from a define position
*/
let oxo2 = new Oxo("020010000");

// you can also pass a 1D array of 9 (0|1|2) elements
let oxo3 = new Oxo([0, 2, 0, 0, 1, 0, 0, 0, 0]);
let oxo4 = new Oxo(["0", "2", "0", "0", "1", "0", "0", "0", "0"]);

// you can also pass a 2D array of 9 (0|1|2) elements
let oxo5 = new Oxo([[0, 2, 0], [0, 1, 0], [0, 0, 0]]);
let oxo6 = new Oxo([["0", "2", "0"], ["0", "1", "0"], ["0", "0", "0"]]);

methods

• gets
  • getStringBoard
  • get1DArray
  • get2DArray
  • getCurrentPlayer
  • getMoves
  • getBestMove
  • getCurrentScore
  • getWinningMoves, getLosingMoves, getDrawingMoves
• is
  • isValidMove
  • isWinning
  • isFinished
• make | undo move
  • makeMove
  • undoMove
  • undoLastMove

getStringBoard()

This method returns the current board in the format of a 9 length string of (0|1|2).

oxo.getStringBoard();

get1DArray()

This method returns the current board in the format of a 9 length array of (0|1|2).

Number not string!

//could also be write:  oxo.get1DArray(use_int=true);
// return something like : [0, 0, 0, 0, 0, 0, 0, 0, 0]
oxo.get1DArray();
//could also be write:  oxo.get1DArray(use_int=false);
// return something like : ["0", "0", "0", "0", "0", "0", "0", "0", "0"]
oxo.get1DArray(false);

get2DArray()

This method returns the current board in the format of a 3x3 length array of (0|1|2).

Number not string!

oxo.get2DArray();

getCurrentPlayer()

This method returns the player for which is the turn, on an empty grid it's 1 and after the first turn it's 2.

On a full grid it returns 2, so make sure to use isFinished to check if the game is finished.

oxo.getCurrentPlayer();

getMoves()

This method returns all of the available moves for the current position in an array with the index from 1 to 9 like:

1 2 3
4 5 6
7 8 9

oxo.getMoves();

getBestMove()

This method return the best move, if multiples moves are the best ones it takes the last one. Move is from 1 to 9 like before:

oxo.getBestMove();

getCurrentScore()

This method returns the expected score with perfect play from both players.

• 1 -> player 1 is winning
• 2 -> player 2 is winning
• 0 -> draw

oxo.getCurrentScore();

getWinningMoves(), getLosingMoves(), getDrawingMoves()

These methods returns respectively all of the winning moves, losing moves and drawing moves available for the current position.

oxo.getWinningMoves();
oxo.getLosingMoves();
oxo.getDrawingMoves();

isValidMove(index)

This method check if the index is between 1 and 9 (index >= 1 && index <= 9) and if the square of this index (starting from 1) in the current grid is available.

oxo.isValidMove(1);

isWinning()

This method check if the current position is winning for the last player.

oxo.isWinning();

isFinished()

This method check if the current position has all its squares full.

oxo.isFinished();

makeMove(index)

This method make the move of the given index.es (starting from 1) for the player for which it's the turn. Throw an error if the move is not possible, so make sure to check with isValidMove before.

// the three lines does the same thing
oxo.makeMove(1).makeMove(2).makeMove(3);
oxo.makeMove(1, 2, 3);
oxo.makeMove([1, 2, 3]);

undoMove(index)

This method undo the move of the given index (starting from 1) for the player for which it was the turn. Throw an error if:

• the square is empty
• if the square is outside the grid
• if the player which played on this index wasn't the last player to play

oxo.undoMove(1);

undoLastMove()

This method undo the last move played.

// undo the last move
oxo.undoLastMove();
// undo the two last moves
oxo.undoLastMove(2);