From: Logan Capaldo <logancapaldo@...>
Date: 2006-06-04T07:01:10+09:00
Subject: Re: Where can one find examples of masterful Ruby code?


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.