Nilai default Konstruktor Kelas TypeScript

constructor(name: string, level: number, image: string, type: UnitTypes, scaleAttributes: Function, id?: number, side?: Side, position?: Position) {
        this._id = id || -1;
        this._side = side || Side.NEUTRAL;
        this._type = type;
        this._name = name;
        this._level = level;
        this._position = position || new Position(0, 0);
        this._health = scaleAttributes(level);
        this._image = image;
    }
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