Comment by throwaway4good

Looks good.

Curious about the syntax of function declaration - i.e.:

   A = x * y + x

And then I invoke it by:

   A(2, 3)

Implicitly using the order of which the parameters were used in the function declaration.

Rather than having it explict either via:

   A = (x, y) => x * y + x

Or via named parameters:

   A(x = 2, y = 3)

Why this design?