How can I convert JavaScript code to Java, specifically focusing on how to use instanceof and replace overload?

Imagine having this function in JavaScript:

this.add = function (x, y) {
        if (x instanceof Vector2d) {
            this.x += x.x;   
            this.y += x.y;
            return this;
        }
        this.x += x;
        this.y += y;
        return this;
    };

Should I overload it in Java like this:

    public Vector2D add(Vector2D other) {
        this.x += other.x;
        this.y += other.y;
        return new Vector2D(this.x, this.y);
    }
    public Vector2D add(double number) {
        this.x += number;
        this.y += number;
        return new Vector2D(this.x, this.y);
    }

Is there a more efficient way to handle these operations?

Answer №1

public class Vector2D {
    private double x;
    private double y;

    //...

    public Vector2D add(Vector2D other) {
        this.x += other.x;
        this.y += other.y;
        return this;
    }
    public Vector2D add(double x, double y) {
        this.x += x;
        this.y += y;
        return this;
    }

    //...
}

Instead of creating a new instance of Vector2D every time you call the method, you can simply return this, similar to how it is done in the JavaScript version.

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