From: Robert Klemme <shortcutter@...>
Date: 2010-07-21T19:55:18+09:00
Subject: Re: How to check if x is a multiple of y

2010/7/21 Xavier Noria <fxn@hashref.com>:
> On Wed, Jul 21, 2010 at 12:12 PM, Tom Ha <tom999@gmx.net> wrote:
>
>> what's the most simple solution in Ruby to check if value x is a
>> multiple of y?
>
> That's typically done with the modulus operator, Active Support
> defines it this way
>
>    class Integer
>      # Check whether the integer is evenly divisible by the argument.
>      def multiple_of?(number)
>        number != 0 ? self % number == 0 : zero?
>      end
>    end
>
> It is special-cased because you can't do modulus 0.

I see a benchmark lurking: that version vs. this one.

class Integer
  def multiple_off? number
    zero? || self % number == 0
  end
end

:-)

Don't have the time right now...

Cheers

robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/