From: "Kroeger, Simon (ext)" <simon.kroeger.ext@...>
Date: 2006-04-13T22:43:59+09:00
Subject: Re: Range#size

 

> -----Original Message-----
> From: James Edward Gray II [mailto:james@grayproductions.net] 
> Sent: Thursday, April 13, 2006 3:26 PM
> To: ruby-talk ML
> Subject: Re: Range#size
> 
> On Apr 13, 2006, at 8:20 AM, Meinrad Recheis wrote:
> 
> > dear list,
> >
> > does anyone object to adding the method :size to class Range?
> >
> > class Range
> > 	def size
> > 		max-min+1
> > 	end
> > end
> 
> The problem with it is that it adds method dependancies to Range:
> 
>  >> class Range
>  >>   def size; max - min + 1 end
>  >> end
> => nil
>  >> ("AA".."BB").size
> NoMethodError: undefined method `-' for "BB":String
>          from (irb):2:in `size'
>          from (irb):4
>          from :0
> 
> James Edward Gray II

Well, that's slow but could...

class Range
  def size
    inject(0){|s, dummy| s + 1}
  end
end

...be a solution?

cheers

Simon