From: Moises Trovo <moises.trovo@...>
Date: 2008-02-21T01:18:53+09:00
Subject: Re: Ruby type-safe? Ruby strongly/weakly typed? Ruby pitfalls?

On Sun, Feb 17, 2008 at 7:59 PM, Rule.rule <rule.rule.rule@gmail.com> wrote:
> On Feb 6, 7:56 am, Eivind Eklund <eekl...@gmail.com> wrote:
> > On Feb 6, 2008 2:20 AM,rule.rule.r...@gmail.com
>
> >
> > <rule.rule.r...@gmail.com> wrote:
> > > Hi,
> >
> > > I added some paragraphs to theRubyarticle on Wikipedia:
> >
> > > Type system
> > > - IsRubytype-safe?
> > > - IsRubystrongly typed?
>
> >
> > Def 8 seems to be wrong; you're looking at what a variable refers to,
> > rather than the object type.  The object type is constant throughout
> > object lifetime inRuby(excepting some hacks that I think are
> > C-based).
> >
> > Eivind.
>
> OK, I see what you mean...
> So this might then be a better example of the type of an object
> changing at runtime in Ruby...
>
>
> x = 4
>
> class Fixnum
>  def twice
>    to_i * 2
>  end
> end
>
> puts x.twice
>
>


irb(main):001:0> 4.class
=> Fixnum
irb(main):002:0> (4.to_i*2).class
=> Fixnum

The type doesn't change in your example.