From: Wilson Bilkovich <wilsonb@...>
Date: 2006-10-27T08:37:09+09:00
Subject: Re: simple math question

On 10/26/06, Pete Yandell <pete.yandell@gmail.com> wrote:
>
> On 26/10/2006, at 9:25 AM, Robert Oliver wrote:
>
> > You can determine if a number is odd by doing this:
> >
> > class Fixnum
> >  def odd?
> >    if self % 2 == 0
> >      return nil
> >    else
> >      return true
> >    end
> >  end
> >  def even?
> >    if self % 2 == 0
> >      return true
> >    else
> >      return nil
> >    end
> >  end
> > end
>
> Argh! Ok, I keep coming across code like this, and it's driving me
> nuts. It's like writing:
>
>    if true then true else false end
>
> Well, duh! :)
>
> Just write this:
>
>    class Fixnum
>      def odd?
>        self % 2 == 1
>      end
>      def even?
>        self % 2 == 0
>      end
>    end
>
>

class Fixnum
  def even?
    (self % 2).zero?
  end
  def odd?
    !even?
  end
end