Method constructor

frontend/src/game/classes/BallManager.ts:15–23

(canvasRef: HTMLCanvasElement, onFinish?: (index: number,startX?: number) => void)

    private onFinish?: (index: number,startX?: number) => void;

    constructor(canvasRef: HTMLCanvasElement, onFinish?: (index: number,startX?: number) => void) {
        this.balls = [];
        this.canvasRef = canvasRef;
        this.ctx = this.canvasRef.getContext("2d")!;
        this.obstacles = createObstacles();
        this.sinks = createSinks();
        this.update();
        this.onFinish = onFinish;
    }

    addBall(startX?: number) {
        const newBall = new Ball(startX || pad(WIDTH / 2 + 13), pad(50), ballRadius, 'red', this.ctx, this.obstacles, this.sinks, (index) => {