From: sur max <sur.max@...>
Date: 2007-02-19T00:54:53+09:00
Subject: Re: Instance variable exists?

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Rdoc is there !!


>>ri instance_variable_get
------------------------------------------- Object#instance_variable_get
     obj.instance_variable_get(symbol)    => obj
------------------------------------------------------------------------
     Returns the value of the given instance variable (or throws a
     +NameError+ exception). The +@+ part of the variable name should be
     included for regular instance variables

        class Fred
          def initialize(p1, p2)
            @a, @b = p1, p2
          end
        end
        fred = Fred.new('cat', 99)
        fred.instance_variable_get(:@a)    #=> "cat"
        fred.instance_variable_get("@b")   #=> 99



On 2/18/07, Jason Mayer <slamboy@gmail.com> wrote:
>
> On 2/18/07, SonOfLilit <sonoflilit@gmail.com> wrote:
> >
> > aur-sarafs-computer:~ aursaraf$ ri Object#instance_variable_get -T
> > ------------------------------------------- Object#instance_variable_get
> >      instance_variable_get(ivarname)
> > ------------------------------------------------------------------------
> >      (no description...)
> > aur-sarafs-computer:~ aursaraf$ ruby -v
> > ruby 1.8.5 (2006-12-04 patchlevel 2) [i686-darwin8.8.1]
> >
> > > As you're hopefully aware, though, it's probably not particularly
> > > straightforward because it's discouraged in general.  Peeking at an
> > > object's instance variables is kinda intruding on its privacy.  There
> > > are some valid uses to be sure, but usually I think you're better off
> > > providing accessors for anything of interest outside the object.
> > >
> > > > Question: Why does Object#instance_varialbe_get have no
> documentation?
> > > > It's behaviour isn't that clear in cases like
> > >
> > > Where are you looking?  "ri instance_variable_get" gives me docs.
>
>
> FYI I get the same thing.
> E:\Documents and Settings\Jason>ri instance_variable_get
> ------------------------------------------- Object#instance_variable_get
>      instance_variable_get(ivarname)
> ------------------------------------------------------------------------
>      (no description...)
>
> E:\Documents and Settings\Jason>ruby -v
> ruby 1.8.5 (2006-08-25) [i386-mswin32]
>
> documentation here:
> http://www.ruby-doc.org/core/classes/Object.src/M000323.html
>



-- 
sur
http://expressica.com

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