From: Douglas Livingstone <rampant@...>
Date: 2005-04-05T04:44:26+09:00
Subject: Re: doubly linked list in Ruby?

On Apr 4, 2005 8:39 PM, Randy Kramer <rhkramer@gmail.com> wrote:
> 
> But (just asking), what about performance?  Is an entire new array created, or
> is the new stuff (only) put in a newly allocated piece of memory and a
> pointer/reference/whatever inserted into (maybe a linked list which
> implements) the array?
> 

irb(main):001:0> a = [1,2,3]
=> [1, 2, 3]
irb(main):002:0> b = a
=> [1, 2, 3]
irb(main):003:0> b[2,0] = 4
=> 4
irb(main):004:0> a
=> [1, 2, 4, 3]
irb(main):005:0> b
=> [1, 2, 4, 3]
irb(main):006:0> a == b
=> true

[] is sugar for Array.new, they are objects like any other.

hth,
Douglas