From: "byroot (Jean Boussier)" <noreply@ruby-lang.org>
To: ruby-core@ruby-lang.org
Subject: [ruby-core:109839] [Ruby master Bug#18994] Range#last(n) returns empty for single-element Integer Range
Date: Sun, 04 Sep 2022 07:49:44 +0000 (UTC) [thread overview]
Message-ID: <redmine.journal-99076.20220904074943.52465@ruby-lang.org> (raw)
In-Reply-To: redmine.issue-18994.20220903152011.52465@ruby-lang.org
Issue #18994 has been updated by byroot (Jean Boussier).
Backport changed from 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN to 2.7: WONTFIX, 3.0: REQUIRED, 3.1: REQUIRED
Thanks, I have a patch for it: https://github.com/ruby/ruby/pull/6324
----------------------------------------
Bug #18994: Range#last(n) returns empty for single-element Integer Range
https://bugs.ruby-lang.org/issues/18994#change-99076
* Author: masasakano (Masa Sakano)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x86_64-darwin20]
* Backport: 2.7: WONTFIX, 3.0: REQUIRED, 3.1: REQUIRED
----------------------------------------
`Range#last(n)` with a single-element of Integer returns an empty Array. It should return a one-element Array.
Interestingly, when the element is a String, `last(n)` returns a one-element Array, expectedly.
I have checked the behaviour with some selected past versions of Ruby. In up to Ruby-2.6.5, it worked correctly. In Ruby-2.7.0, it doesn't. Nor in Ruby-3, including the current version (Ruby-3.1.2).
The following demonstrates the behaviour (Ruby-3.1.2; same in Ruby-2.7.0). Only the first one does not work in the way it should.
```ruby
(8..8).last(1) # => [] (!!) (should be: [8])
(8..8).to_a.last(1) # => [8]
(8..8).first(1) # => [8]
(?a..?a).last(1) #=> ["a"]
(?a..?a).to_a.last(1) #=> ["a"]
(?a..?a).first(1) #=> ["a"]
```
--
https://bugs.ruby-lang.org/
next prev parent reply other threads:[~2022-09-04 7:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-03 15:20 [ruby-core:109834] [Ruby master Bug#18994] Range#last(n) returns empty for single-element Integer Range masasakano (Masa Sakano)
2022-09-04 7:49 ` byroot (Jean Boussier) [this message]
2022-10-23 10:41 ` [ruby-core:110489] " nagachika (Tomoyuki Chikanaga)
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