From: ara.t.howard@...
Date: 2006-12-14T08:22:51+09:00
Subject: Re: map taking an argument (was: Re: join_with)

On Thu, 14 Dec 2006 dblack@wobblini.net wrote:

> Hi --
>
> On Thu, 14 Dec 2006, Christian Neukirchen wrote:
>
>> "Martin DeMello" <martindemello@gmail.com> writes:
>> 
>>>> (1..10).map &lambda {|i| i*2}
>>> => [2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
>> 
>> David, do you want to allow  (1..10).map(:*, 2)  ?
>
> I don't particularly want to allow map(:anything) :-)  I was just
> somewhat surprised to see the idea return in a slightly new form,
> since Matz had rejected it a while ago.
>
> If I were designing map(:name), I don't think I'd want it to take
> arguments.  But I have no technical grounds for saying so, only
> aesthetic ones.

you confound me david!  ;-)

if you like 'e.map :m' how can you __not__ like

   harp:~ > cat a.rb
   class Array
     def map *a, &b
       m, *a = *a
       super &(b || lambda{|o| o.send m, *a})
     end
   end

   prefixes = %w( foo-bar bar-foo ).map :[], /^\w+/
   p prefixes


   harp:~ > ruby a.rb
   ["foo", "bar"]

?

-a
-- 
if you find yourself slandering anybody, first imagine that your mouth is
filled with excrement.  it will break you of the habit quickly enough. - the
dalai lama