From: Ilmari Heikkinen <ilmari.heikkinen@...>
Date: 2007-01-09T22:12:24+09:00
Subject: Re: Why is there a seperate Math class?

On 1/9/07, Phrogz <gavin@refinery.com> wrote:
> Daniel Finnie wrote:
> > Why does everything have to be Math.<func>(num)?  Isn't num.func more
> > object oriented-ish?
>
> In addition to the answers by others, what would you do for those math
> functions whose arity isn't 1?
>
>   Math.methods(false).select{ |n| Math.method(n).arity != 1 }
>   #=> ["hypot", "atan2", "ldexp"]
>
> All three take two arguments. While 3.hypot(4) *might* make
> sense--given one leg of a right triangle, how long is the hypotenuse to
> a given other leg--30.atan2( 40 ) makes little sense to me.

hypot and atan are vector methods, so [30, 40].atan2, [3,4].hypot
would be correct in the OO-sense, much like #max and #min are in Array
and not Math (compare to e.g. JavaScript where there is Math.max and
Math.min)