From: tamouse mailing lists <tamouse.lists@...>
Date: 2013-02-19T12:23:39+09:00
Subject: Re: Adding camelize and underscore to String

On Mon, Feb 18, 2013 at 12:07 AM, Rob Marshall <lists@ruby-forum.com> wrote:
> I know this is just a silly question, and that these methods are
> available in Rails, but is this a viable way to add them to Ruby withOUT
> Rails? e.g.:

Not silly. Sometimes it *is* easier to reinvent the wheel, if the
wheel is easy to reinvent.

> class String
>   def camelize
>     self.split("_").each {|s| s.capitalize! }.join("")
>   end
>   def camelize!
>     self.replace(self.split("_").each {|s| s.capitalize! }.join(""))
>   end
>   def underscore
>     self.scan(/[A-Z][a-z]*/).join("_").downcase
>   end
>   def underscore!
>     self.replace(self.scan(/[A-Z][a-z]*/).join("_").downcase)
>   end
> end

I do this a bit differently:

class String
  def camelize
    self = self.dup
    self.camelize!
  end
  def camelize!
    self.replace... # as you have it
  end
  def underscore
    self = self.dup
    self.underscore!
  end
  def underscore!
    self.replace... # as you have it
  end
end

I've also seen it done instead of monkey patching, to insert a new
module into String:

module Camelizer
  # method defs as above
end

String.send(:include Camelizer)