P6JavaScript

let gameBoard = [];
let empty;

function generateGameBoard() {
    let $tds = $("#table").find("td"), number = 0;
    while (number < 9) {
        for (let i = 0; i < 3; i++) {
            var aux = [];
            for (let j = 0; j < 3; j++) {
                $($tds[number]).attr("i", i).attr("j", j);
                aux.push($($tds[number]));
                number++;
            }
            gameBoard.push(aux);
        }
    }
}

function generateRandom() {
    let numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8];
    let randi, randj, dimension = numbers.length, aux;
    while (dimension > 0) {
        randi = Math.floor(Math.random() * numbers.length);
        randj = Math.floor(Math.random() * numbers.length);
        aux = numbers[randi];
        numbers[randi] = numbers[randj];
        numbers[randj] = aux;
        dimension--;
    }
    count = 0;
    for (let i = 0; i < 3; i++) {
        for (let j = 0; j < 3; j++) {
            if (numbers[count] !== 0)
                gameBoard[i][j].html(numbers[count]);
            else
                empty = gameBoard[i][j];
            gameBoard[i][j].click(function () {
                console.log($(this).html() + " i=" + $(this).attr("i") + " j=" + $(this).attr("j"));
            });
            count++;
        }
    }
}

function move(keyCode) {
    let i = parseInt(empty.attr("i")), j = parseInt(empty.attr("j"));
    switch (keyCode) {
        case 37:
            console.log("Left");
            moveLeft(i, j);
            break;
        case 39:
            console.log("Right");
            moveRight(i, j);
            break;
        case 38:
            console.log("Up");
            moveUp(i, j);
            break;
        case 40:
            console.log("Down");
            moveDown(i, j);
            break;
    }
    if (checkVictory()) {
        alert("Felicitari!");
        location.reload();
    }
}

function startGame() {
    generateGameBoard();
    generateRandom();
}

function moveLeft(i, j) {
    if (j !== 2) {
        switchTwo(gameBoard[i][j + 1], gameBoard[i][j]);
    }
}

function moveRight(i, j) {
    if (j !== 0) {
        switchTwo(gameBoard[i][j - 1], gameBoard[i][j]);
    }
}

function moveUp(i, j) {
    if (i !== 2) {
        switchTwo(gameBoard[i + 1][j], gameBoard[i][j]);
    }
}

function moveDown(i, j) {
    if (i !== 0) {
        switchTwo(gameBoard[i - 1][j], gameBoard[i][j]);
    }
}

//p2 mereu empty
function switchTwo(p1, p2) {
    let aux = p1.html();
    p1.html(p2.html());
    p2.html(aux);
    empty = p1;
}

function checkVictory() {
    if (gameBoard[2][2].html() === "") {
        let against = ["1", "2", "3", "4", "5", "6", "7", "8", ""], count = 0;
        for (let i = 0; i < 3; i++) {
            for (let j = 0; j < 3; j++) {
                if (against[count] !== gameBoard[i][j].html())
                    return false;
                count++;
            }
        }
        return true;
    }
    return false;
}