From: ara.t.howard@...
Date: 2007-02-16T15:34:22+09:00
Subject: Re: functional.rb

On Fri, 16 Feb 2007, Gregory Brown wrote:

> On 2/16/07, ara.t.howard@noaa.gov <ara.t.howard@noaa.gov> wrote:
>
>> why not
>> 
>>    harp:~ > cat a.rb
>>    class Object
>>      def tap &b
>>        instance_eval &b
>>        return self
>>      end
>>    end
>> 
>>    puts "foobar".tap{ gsub! /bar/, '' }  #=> foo
>
> Well that prevents you from being able to access the enclosing scope,
> but maybe that's okay for a tap.  You could always offer both by
> checking block arity.
>

hrrrmmm.  i wouldn't say 'prevents' - but confuses ;-)

   harp:~ > cat a.rb
   class Object
     def tap &b
       b.arity == 1 ? yield(self) : instance_eval(&b)
       return self
     end
   end

   s, re = "foobar", /bar/

   puts s.tap{ gsub! re, nil.to_s }.upcase  #=> FOO

   harp:~ > ruby a.rb
   FOO

good idea on the arity btw.

-a
-- 
we can deny everything, except that we have the possibility of being better.
simply reflect on that.
- the dalai lama