From: Nikolai Weibull <mailing-lists.ruby-talk@...>
Date: 2005-08-09T03:20:21+09:00
Subject: Re: Adding yet another Array.new form

Berger, Daniel wrote:

> > How about adding a fifth way of constructing new arrays?:
> > 
> > Array.new{|array| block }

> Conflicts with the current 4th form, unless you want a "no argument
> but block exists" form, e.g. Array.new(x){ .. } would be different
> from Array.new{ .. }.

Yes, that was the idea.

> If anything, we should remove the 3rd form altogether, Array.new(ary),
> and replace the 4th form with what (I think) has been suggested in
> later replies to this thread, i.e. yield self if block_given? for
> most, if not all, constructors.
 
Well, how do you propose to do it for most, but not all constructors?
Yes, I think that there may be merit to adding a Class.create method as
well, but that's a lot more drastic than adding a simple case for
Array.new, which already has a lot of ways of creating itself.  One more
wouldn't be imposing much, but would be rather useful I feel (more
useful with the 4th form in my opinion).

> > Here, array is the newly created array, and the block will
> > initialize it as it sees fit, e.g,
> > 
> > ary = Array.new{ |ary| 5.times{ |i| ary << i } },

> Just to clarify, what should "ary" look like at the end of this
> example?

ary # => [0, 1, 2, 3, 4],
        nikolai

-- 
Nikolai Weibull: now available free of charge at http://bitwi.se/!
Born in Chicago, IL USA; currently residing in Gothenburg, Sweden.
main(){printf(&linux["\021%six\012\0"],(linux)["have"]+"fun"-97);}