Tic-Tac-Toe Minimax AI Module


Module that given a tic-tac-toe board determines the AI's move and/or returns next state board based on the given board. It has three level of AI's difficulty.
Note: Only tested on a 3x3 board

| Difficulty | Description |
|:-------------:|:-------------:|
| Easy | AI's move is decided solely based on Math.random() |
| Hard | AI's move is decided through the minimax algorithm |
| Normal | AI's move has 50/50 chance to be a "Hard difficulty" move or a "Easy difficulty" move |

##### DEMO

Modules

$3

``javascript
const nextMove = ComputerMove( board, symbols, difficulty ); //returns a Number
`

This module computes the best move to be made by the computer.

| Inputs | Description |
|:-------------:|:-------------:|
| symbols | Object with huPlayer and aiPlayer symbol. |
| board | Array representing the board. Empty squares should have the value of the index numer in the respective element. |
| difficulty | "Easy"\|"Normal"\|"Hard" |

Example:
`javascript
import Minimax from 'tic-tac-toe-minimax'
const { ComputerMove } = Minimax;

const huPlayer = "X";
const aiPlayer = "O";
const symbols = {
huPlayer: huPlayer,
aiPlayer: aiPlayer
}
const difficulty = "Hard";
const board = [0,1,aiPlayer,3,huPlayer,huPlayer,6,7,8];

const nextMove = ComputerMove( board, symbols, difficulty ); //returns 3
`

$3

This module wraps the ComputerMove module and calculates the "next" board.
If a final game condition in reached it will be informed through the winner property.
Also, if a final condition is met the board will remain the same.

`javascript
const gameState = GameStep(board, symbols, difficulty); //returns an Object
/*
returns {
winner: ("huPlayer" | "aiPlayer" | "draw" | null),
board: Array
}
*/
`
If the provided board has both winning conditions (both player and AI won somehow),
the winner will be the player.

Example:
`javascript
import Minimax from 'tic-tac-toe-minimax'
const { GameStep } = Minimax;

const huPlayer = "X";
const aiPlayer = "O";
const symbols = {
huPlayer: huPlayer,
aiPlayer: aiPlayer
}
const difficulty = "Hard";
const board = [0,1,aiPlayer,3,huPlayer,huPlayer,6,7,8];

const gameStep = GameStep( board, symbols, difficulty );
/*
returns {
winner: null,
board: [0,1,aiPlayer,aiPlayer,huPlayer,huPlayer,6,7,8]
}
*/
``

$3

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