From: Florian Gilcher <flo@...>
Date: 2010-04-08T03:01:41+09:00
Subject: Re: Dissapearing data from array


On Apr 7, 2010, at 7:47 PM, Noé Alejandro wrote:

> Hi all.
> 
> I have the next problem.
> 
> a = %w(a b)
> z = %w(1)
> a.insert(1, z)
> puts a
>  a
>  1
>  b

Try 

  puts a.inspect
  #=> ["a", ["1"], "b"]

> 
> z.clear
> puts a
>  a
>  b

  puts a.inspect
  #=>  ["a", [], "b"]
> 
> Oopss... where "1" is? what happened? what can I do to keep "1" when I
> clear the array (z)?

Ruby uses references. So a.insert(1, z) inserts a reference to z at position 1 in the array. So once you clear z,  it will be cleared noticed by everyone referring to it - a, in this case.

Regards,
Florian