From: dblack@...
Date: 2007-07-26T03:35:56+09:00
Subject: Re: Question - Passing parameters by reference

Hi --

On Thu, 26 Jul 2007, Chris Thiel wrote:

> What if the method is returning something else already and you don't want
> to have to return the changed value? How do you pass in a variable to a
> method and have the change stick when it exists the method in ruby?

You can change an object:

   def change_me(str)
     str.upcase!
   end

   s = "abc"
   change_me(str)
   puts s          # ABC

But you can't change the bindings.  In the example, I've got s and str
both containing references to the same string.  But the names of the
identifiers themselves, s and str, are solely the business of their
local scopes, which are different as between the method body and the
calling context.


David

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