From: matz@... (Yukihiro Matsumoto)
Date: 2002-06-12T17:54:01+09:00
Subject: Re: a new block parameter/variable notation (Re: ruby-dev summary 17252-17356)

Hi,

In message "Re: a new block parameter/variable notation (Re: ruby-dev summary 17252-17356)"
    on 02/06/12, Kent Dahl <kentda@stud.ntnu.no> writes:

|Not wanting to flog a dead horse, but I just wonder what the final word
|on the :a notation was? 

Like |a,:b,c| (as in 5555), |a,b~,c| (as in 5592), or |a,{b},c| (as in
42266)?

I don't like them.  From my observation, block parameters used as
either iteration variables or closure arguments, not usually mixed.
:a notation and the like forces extra cost to one of the major usages,
allowing unimportant mixing.  I felt it's good to prepare independent
(and hopefully equally readable) notations for each major usage.

|Maybe I have misunderstood some of the other approaches, but I get the
|sinking feeling that the order that the iterator methods yield the
|arguments have bearing on what I can do on the block side. I see that
|this problem is really defined away by the constraint, but I fear that
|this decision can preempt some useful, future usages. (Though I can't
|think of any good examples now...) 

I'm not in hurry at all for this issue.  [ruby-talk:5555] was two
years ago.

							matz.