From: Tobias Reif <tobiasreif@...>
Date: 2001-09-20T20:02:21+09:00
Subject: [ruby-talk:21430] chain methods inside and outside the class; how to intermingle mine and Strings' methods?

Hi;

I'm trying to understand objects, and instance @variables. Now I have 
two questions:

--

# this is just a learning file, and a test model for a real program
# question 1 of 2: how to code it more appropriately/the Ruby way?

class HoX < String

   def initialize s
     @s = s
   end

   def give_string
     return @s.to_s
   end

   def delete_digits
     HoX.new @s.gsub /\d/,''
   end

   def repeat
     HoX.new @s.dup * 2
   end

   def all
     # chain method calls here
     delete_digits.repeat
   end

end

h = HoX.new '68a345b89798c'

# also chain method calls here
all_HoX_meths = h.all.give_string

# and chain them here, with String methods
all_HoX_plus_string_meths = 
h.delete_digits.repeat.give_string.upcase.reverse.chop.capitalize.swapcase

# question 2: how to make it possible to write:
   #  intermingled = h.upcase.repeat.chop # perhaps to_s

puts all_HoX_meths , all_HoX_plus_string_meths
#-> abcabc
#-> cBACB

--

Tobi

-- 
Tobias Reif
http://www.pinkjuice.com/myDigitalProfile.xhtml

go_to('www.ruby-lang.org').get(ruby).play.create.have_fun
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