From: Brian Candler <b.candler@...>
Date: 2010-08-11T19:38:53+09:00
Subject: Re: assignment question

Kaye Ng wrote:
> #Run this code
> 
> x=[2,6,5,9]
> y = x

x and y are pointing to the same array

> x=[1,2,3,4]

Now x is pointing to a different array (look at x.object_id and 
y.object_id)

> x=[2,6,5,9]
> y = x

x and y are pointing to the same array

> x.pop

x and y are still pointing to the same array. You modified this array by 
popping an element off it.

So you need to remember:
* Every value in Ruby is an object *reference*
* Most objects in Ruby are mutable, i.e. their internal state can 
change.

>> a = "hello"
=> "hello"
>> b = a
=> "hello"
>> a.upcase!
=> "HELLO"
>> a
=> "HELLO"
>> b
=> "HELLO"
-- 
Posted via http://www.ruby-forum.com/.