From: Florian Gross <florgro@...>
Date: 2007-07-27T23:33:09+09:00
Subject: Re: How to pass arguments by reference in a function

On Jul 27, 8:32 am, "Robert Klemme" <shortcut...@googlemail.com>
wrote:
> 2007/7/27, ashishwave <ashishw...@gmail.com>:
>
> > if i pass arguments in a function then they get passed by value. how
> > to get it passed by reference.
>
> You can't.  There are some solutions to this depending on situation:
>
> 1. inplace modification of arguments (Strings, Arrays, Hashes - all
> sorts of containers)
>
> 2. multiple return values
>
> 3. work with instance variables

4. passing lambdas around

x, y = 1, 2
x_ref = [lambda { x }, lambda { |x| }]
y_ref = [lambda { y }, lambda { |y| }]
swap(x_ref, y_ref}

See http://flgr.0x42.net/code/variable.rb