From: Joshua Collins <josh@...>
Date: 2009-03-31T07:11:39+09:00
Subject: Re: When to use instance variables @

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[quote]This is not true when using class variables (@@). These need to be
"declared"
at the beginning of the class:[/quote]

You are incorrect.

On Mon, Mar 30, 2009 at 6:05 PM, I=F1aki Baz Castillo <ibc@aliax.net> wrote=
:

> El Martes 31 Marzo 2009, Albert Schlef escribi=F3:
> > In Ruby you declare nothing. (That's unlike languages like Java, C,
> > etc., where everything has to be declated before use.)
>
> This is not true when using class variables (@@). These need to be
> "declared"
> at the beginning of the class:
>
>
> class KK
>
>    @@koko   # <-- WRONG since no assignement is done.
>             #     @@koko =3D #SOMETHING#   is required.
>
>    def show_var
>      puts "koko =3D #{@@koko}"
>    end
>
>    def set_var(v)
>      @@koko =3D v
>    end
>
> end
>
>
> irb(main):022:0> k=3DKK.new
>
> irb(main):023:0> k.show_var
> NameError: uninitialized class variable @@koko in KK
>
> irb(main):024:0> k.set 123
> irb(main):025:0> k.show_var
> koko =3D 123
>
>
> --
> I=F1aki Baz Castillo <ibc@aliax.net>
>
>

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