la-visitor/assets/position.js

class position {
    #x;
    #y;

    constructor(x = 0, y = 0) {
        this.x = x;
        this.y = y;
    }

    set x(target) {
        if (typeof(target) !== "number") {
            throw new TypeError("X cord must be an number.");
        }

        this.#x = target;
    }

    set y(target) {
        if (typeof(target) !== "number") {
            throw new TypeError("Y cord must be an number.");
        }

        this.#y = target;
    }

    get x() {
        return this.#x;
    }

    get y() {
        return this.#y;
    }

    compare(target) {
        if (!(target instanceof position)) {
            throw new TypeError("Can only compare position with position.");   
        }

        const result = new position();

        result.x = target.x - this.x;
        result.y = target.y - this.y;

        return result;
    }
}

export { position };