From: Mathieu Bouchard <matju@...>
Date: 2002-08-05T00:47:40+09:00
Subject: Re: Should this work?


On Sun, 4 Aug 2002, Gavin Sinclair wrote:
> Now, I love the "map" method, but sometimes its use is more verbose than it
> could be.  It "would be nice" if one could do the following things:
> names = %w(john mary adam jacky)
> names.map { capitalize }          # -> ["John", "Mary", "Adam", "Jacky"]



You can add something like that yourself:

module Enumerable
  def map(a=nil,&b)
    r=[]
    each(&(if a
           then proc {|v| r << (v.send a) }
           else proc {|v| r << (b.call v) } end))
    r end end

names = %w(john mary adam jacky)
names.map :capitalize            #==> ["John", "Mary", "Adam", "Jacky"]



Here's something else for you:

class Many
  def initialize(*a)
    @a=a end
  def method_missing(*m,&b)
    @a.each {|e| e.send(*m,&b) } end end
def M(*a)
  Many.new(*a) end

M(a=[],b=[42]) << "hello"
p a                       #==> ["hello"]
p b                       #==> [42,"hello"]



________________________________________________________________
Mathieu Bouchard                       http://artengine.ca/matju