From: Ruby Student <ruby.student@...>
Date: 2008-10-05T20:26:01+09:00
Subject: Re: question regarding sub!()

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On Sun, Oct 5, 2008 at 6:37 AM, Lex Williams <etaern@yahoo.com> wrote:

> when writing :
>
> string2  = string1
>
> both your variables reference the same address , so , modifications to
> any of them will cause modification to the other .
>
> If you write :
>
> string2 = string1.clone
>
> then you will modify just string2 , when writing sub!
> --
> Posted via http://www.ruby-forum.com/.
>
>
But, why then, the following is not true???
n1 = 100
n2 = n2

To this point the are the same, including the object_id.
But when I assign:
n2 = 200
The n1 does not change and the object_id of n2 change.
Please see the irb session below.


irb
irb(main):001:0> n1 = 100
=> 100
irb(main):002:0> n2 = n1
=> 100
irb(main):003:0> p n1
100
=> nil
irb(main):004:0> p n2
100
=> nil
irb(main):005:0> p n1.object_id
201
=> nil
irb(main):006:0> p n2_object_id
NameError: undefined local variable or method `n2_object_id' for main:Object
from (irb):6
from :0
irb(main):007:0> p n2.object_id
201
=> nil
irb(main):008:0> n2 = 200
=> 200
irb(main):009:0> p n1
100
=> nil
irb(main):010:0> p n2
200
=> nil
irb(main):011:0> p n1.object_id
201
=> nil
irb(main):013:0> p n2.object_id
401
=> nil
irb(main):014:0>


Thank you

Ruby Student

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