From: Trans <transfire@...>
Date: 2005-10-12T15:46:53+09:00
Subject: Re: Default argument values for blocks


Yukihiro Matsumoto wrote:
> Hi,
>
> In message "Re: Default argument values for blocks"
>     on Wed, 12 Oct 2005 02:25:33 +0900, Yukihiro Matsumoto <matz@ruby-lang.org> writes:
>
> ||Is there a reason why I can't do this?
> ||
> ||   foo = lambda { |foo = bar| puts foo }
> ||   foo.call
> ||
> ||I can't think of any good reason why this isn't valid.
> |
> |Mostly because yacc does not allow it.  It confuses
> |
> |  lambda { |foo = bar| puts foo }
> |
> |as
> |
> |  lambda { |foo = (bar| puts foo) }
> |
> |and causes syntax error.
>
> For your information, you can do
>
>   foo = ->(foo="bar"){puts foo}
>   foo.call

What of &?

  a.each( &->(foo="bar"){puts foo} )  # Ick.

Can we drop?

  a.each( ->(foo="bar"){puts foo} )   # Better.

T.