From: "David A. Black" <dblack@...>
Date: 2004-07-07T01:31:03+09:00
Subject: Re: Array::index and rindex operator

Hi --

On Wed, 7 Jul 2004, Hal Fulton wrote:

> Robert Klemme wrote:
> >> I can't remember whether there are any methods that protest
> >>if you give an argument and a block....  I have a memory that there
> >>are one or two, but I'm not sure what they are.
> > 
> > Well, what implication would that have?  Do you mean to say it's not
> > common in Ruby to have methods that either accept a block or an argument?
> 
> I think it's common to accept a block or an arg, but it raises the
> question of what to do when *both* are given:
> 
>    1. raise an exception
>    2. do something meaningful
> 
> And I'm not sure whether most core methods do (1) or (2).

I still have this nagging memory of a method that raises an exception
when given both, but I can't pin it down.

The ones I can think of that don't just ignore the block (which of
course any method will do if it doesn't yield) seem to call the block
either with the argument (#inject) or with the result of a calculation
(File.open).  


David

-- 
David A. Black
dblack@wobblini.net