Forum: Ruby-core [Feature #2832] Vector#each and Enumerable

Feature #2832: Vector#each and Enumerable
http://redmine.ruby-lang.org/issues/show/2832

Author: Marc-Andre Lafortune
Status: Open, Priority: Normal
Assigned to: Keiju Ishitsuka, Category: lib, Target version: 1.9.2

Vector should implement #each and include Enumerable, since it is so 
Array-like.

Enumerable methods that return an array should probably be specialized 
to return a Vector (e.g. map, first, ...)

See also [ruby-core:28403], [redmine:2831]

Issue #2832 has been updated by Yukihiro Matsumoto.

Status changed from Open to Closed
% Done changed from 0 to 100

This issue was solved with changeset r26801.
Marc-Andre, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

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http://redmine.ruby-lang.org/issues/show/2832

Issue #2832 has been updated by Marc-Andre Lafortune.

Status changed from Closed to Open

Thanks Matz.

Vector#map/collect should return Vector, no?

I'm fine with the others methods, like #drop(_while), #find(_all), 
#first, returning arrays though.
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http://redmine.ruby-lang.org/issues/show/2832

Hi,

In message "Re: [ruby-core:28571] [Feature #2832](Open) Vector#each and 
Enumerable"
    on Tue, 9 Mar 2010 13:29:03 +0900, Marc-Andre Lafortune 
<redmine@ruby-lang.org> writes:

|Vector#map/collect should return Vector, no?

I don't think so.  It returns a collection of values given from the
block.  Array is a representation of collection.  Matrix#collect
now returns Matrix, but I consider it caused by misunderstanding.

              matz.

Issue #2832 has been updated by Marc-Andre Lafortune.


I'm probably crazy, and I must be the only one wishing this, but I wish 
that #collect was used to collect elements (and always returned an 
array), while #map was used to map an object by applying a functor to 
its element (and returned the original class when possible, like Set, 
Matrix, ...)

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http://redmine.ruby-lang.org/issues/show/2832

>
>
> I'm probably crazy, and I must be the only one wishing this, but I wish
> that #collect was used to collect elements (and always returned an array),
> while #map was used to map an object by applying a functor to its element
> (and returned the original class when possible, like Set, Matrix, ...)
>
>
I think Vector#to_a#map is better than Vector#collect, since it's far 
more
explicit for that purpose

I agree with the fact methods like map should return their own kind of
Enumerable (for example sorting a Hash result in ... an Array)