From: Yukihiro Matsumoto <matz@...>
Date: 2009-10-27T09:49:23+09:00
Subject: [ruby-core:26347] Re: Suggestion: #from_array

Hi,

In message "Re: [ruby-core:26341] Suggestion: #from_array"
    on Tue, 27 Oct 2009 07:28:46 +0900, Magnus Holm <judofyr@gmail.com> writes:

|In 1.8 we have the annoying "problem" that { }.map/select/reject/sort
|returns an Array. This has been fixed in 1.9, but if you have your own
|class which includes Enumerable, they will still return an Array.

#map is a collection of values from blocks, so that it should be array
(or any representation of collection), not the instance of receiver
class.

For other methods, some abstraction may be useful, but I don't think
your #from_array proposal works well.  The name #from_array does not
represent its role in enumeration abstraction.  Besides that, some
enumerable class may be immutable.

							matz.