[rmeby]

I would imagine operator overloading helps with vectors so you can do things like:

    public static Vector operator -(Vector a, Vector b)
    {
        Vector v = new Vector();
        v.X = a.X - b.X;
        v.Y = a.Y - b.Y;

        return v;
    }

So then you can just write:

    Vector result = myVector1 - myVector2;

[kevingadd]

Also if you wrote the JS equivalent of that, each vector would be 3-4 individually heap-allocated doubles in v8, because they aren't able to allocate floating-point values inline. There would also be a new heap allocation for the result vector itself when performing each operation. The overhead really adds up. :/

At one point Mozilla had a prototype implementation of strongly-typed value types in JavaScript, but it fell by the wayside once WebAssembly became a thing.

[ygra]

You can use an array to keep the doubles together. V8 has something like half a dozen different array types, depending on what is inside and how it's used.

[throwaway23532]

Why not implement a method?

var result = myvector1.sub(myvector2)