From: Vlad GALU <vladgalu@...>
Date: 2006-06-04T07:05:35+09:00
Subject: Re: Where can one find examples of masterful Ruby code?

On 6/4/06, Logan Capaldo <logancapaldo@gmail.com> wrote:
>
> On Jun 3, 2006, at 4:48 PM, Alder Green wrote:
>
> > For example: check if integer i is a power of 2, with an expression no
> > more than 13 characters long.
> >
> > Solution: (i & (i - 1))
>
> I'm confused.
>
>
> irb(main):001:0> i = 9
> => 9
> irb(main):002:0> (i & (i - 1))
> => 8
>
> So 9 is a power of 2?
>
> As far as 13 characters goes
>
> (i % 2).zero?
>
> is _exactly_ 13 characters and it gives a true or false answer
> instead of zero of something else.

   It also tells you if i is a multiple of 2 :)

>
>
>


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