Feature #2832: Vector#each and Enumerable

• Status: Closed
• Assignee: marcandre (Marc-Andre Lafortune)
• Target version: 2.6

[marcandre (Marc-Andre Lafortune)]

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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]
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[matz (Yukihiro Matsumoto)]

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

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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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[marcandre (Marc-Andre Lafortune)]

• Status changed from Closed to Open

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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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[matz (Yukihiro Matsumoto)]

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Hi,

In message "Re: [ruby-core:28571] Feature #2832 Vector#each and Enumerable"
on Tue, 9 Mar 2010 13:29:03 +0900, Marc-Andre Lafortune [e-mail] 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.

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[marcandre (Marc-Andre Lafortune)]

• Assignee changed from keiju (Keiju Ishitsuka) to marcandre (Marc-Andre Lafortune)

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[marcandre (Marc-Andre Lafortune)]

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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, ...)

=end

[Eregon (Benoit Daloze)]

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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)
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[znz (Kazuhiro NISHIYAMA)]

• Target version changed from 1.9.2 to 2.0.0

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[shyouhei (Shyouhei Urabe)]

• Status changed from Open to Assigned

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[ko1 (Koichi Sasada)]

• Description updated (diff)

ping. status?

[mame (Yusuke Endoh)]

• Target version changed from 2.0.0 to 2.6

Marc-Andre, what do we have to do about this ticket?
I'm setting to next minor. Let me know if there is any task for 2.0.0.

--
Yusuke Endoh [e-mail]

[marcandre (Marc-Andre Lafortune)]

• Status changed from Assigned to Closed

Right, let's close this.

I still think that Vector#map & select be covariant, and I'll change them if ever there's a request to second that.