From: Robert Klemme <shortcutter@...>
Date: 2009-08-13T18:31:05+09:00
Subject: Re: Background on why Ruby doesn't support ++

2009/8/13 Shajith Chacko <demerzel@gmail.com>:
> On Wed, Aug 12, 2009 at 11:20 PM, Adam Lauper<adamlauper@gmail.com> wrote:
>> Anyone know the history on this deliberate omission?
>
> Matz addressed this in ruby-talk 2710:
>
> http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/2710

Basically it is a consequence of the decision to make integers
immutable which makes assignment necessary for a variable which is
incremented.  I guess Matz wanted to make this explicit, hence "+="
Co.

Otherwise you need a counter class, e.g.

Counter = Struct.new :value do
  def initialize(x = 0)
    self.value = x
  end

  def plusplus
    self.value += 1
  end

  alias incr plusplus

  def minusminus
    self.value += 1
  end

  alias decr minusminus
end

:-)

Kind regards

robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/