From: Josh Cheek <josh.cheek@...>
Date: 2010-07-01T18:59:51+09:00
Subject: Re: pathname.rb:270: warning: `*' interpreted as argument prefix

--0015174c45eeeba42c048a508758
Content-Type: text/plain; charset=ISO-8859-1

On Wed, Jun 30, 2010 at 8:55 AM, Brian Candler <b.candler@pobox.com> wrote:

> Josh Cheek wrote:
> > Note: can anyone explain to me what unary * is?
>
> It's just the "splat". AFAIK it's not really an operator and is not
> mapped to a method call; it's part of the language syntax.
> --
> Posted via http://www.ruby-forum.com/.
>
>
I am still unsure what it is, I think that when it is parsed, it just
invokes the to_a method, and then does some interpreter level magic to line
up the args and the params.

Anyway, it definitely invokes to_a (I expect this is similar to how the
ampersand invokes to_proc)

def y(x)
  def x.to_a() [12] end
  yield *x
end
y(/1,2,3/) { |param| param } # => 12

--0015174c45eeeba42c048a508758--