8 Puzzle Game Class

8Puzzle.js

/*
 1 2 3 
 8 _ 5
 4 7 6

 1 2 3 
 8 6 5
 4 7 _

*/
const input = [[1,2,3],[8,"_",5],[4,7,6]];
const EMPTY = "_";
class Game {

    constructor(matrix, empty){
        this.matrix = matrix;
        this.empty = empty; // {x , y}
    }


    equals(position1, position2) {
        if(position1.x === position2.x && position1.y === position2.y){
            return false;
        }
        return true
    }

    changePosition(x,y){
        const emptyX  = this.empty.x;
        const emptyY  = this.empty.y;
        let possible = false;
        this.possibleMoves().forEach( position => {
            if(this.equals(position, {x,y} )){
                possible = true;
            }
        });

        if(!possible){
            console.log("impossible move");
            return;
        }

        const value = this.matrix[x][y];
        this.matrix[x][y] = EMPTY;
        this.empty = {x, y};
        this.matrix[emptyX][emptyY] = value;
        }

    possibleMoves() {
        const {x, y} = this.empty;
        const moves = [];
        // Down Value
        if(this.matrix[x][y-1]){
            moves.push({ x , y: y-1, value: this.matrix[x][y-1]  });
        }
        // UP Value
        if(this.matrix[x][y+1]){
            moves.push({ x , y: y+1, value: this.matrix[x][y+1] });
        }
        // Left Value
        if(this.matrix[x+1][y]){
            moves.push({ x: x+1 , y, value: this.matrix[x+1][y] });
        }
        // Right Value
        if(this.matrix[x-1][y]){
            moves.push({ x:x-1 , y, value: this.matrix[x-1][y] });
        }

        return moves;
    }



}

const game = new Game(input,{x:1,y:1});
game.changePosition(1,2);
console.log(game.matrix);