From: zuerrong <zuerrong@...>
Date: 2010-11-12T10:56:46+09:00
Subject: Re: what's an object?

Hi Brian,

I just tested what you said, the result is opposite, a is changed.

irb(main):026:0> def foo(x)
irb(main):027:1>   puts x.object_id
irb(main):028:1>   x << "world"
irb(main):029:1>   puts x
irb(main):030:1>   puts x.object_id
irb(main):031:1> end
=> nil

irb(main):033:0> a="nice"
=> "nice"

irb(main):034:0> a.object_id
=> 79554920

irb(main):035:0> foo(a)
79554920
niceworld
79554920
=> nil

irb(main):036:0> a
=> "niceworld"


2010/11/11 Brian Candler <b.candler@pobox.com>:

>
> def foo(x)
>  x << " world"
> end
>
> a = "hello"
> foo(a)
>
> a is passed by value, so the method call foo(a) can never affect the
> value of a

-- 
Kind regards,
     Zuer (祖儿)