[#46918] [ruby-trunk - Bug #6820][Open] Time#to_s on NEWS — "no6v (Nobuhiro IMAI)" <nov@...>
8 messages
2012/08/01
[#46922] [ruby-trunk - Bug #6822][Open] Race Condition with Fiber and Process — "MartinBosslet (Martin Bosslet)" <Martin.Bosslet@...>
8 messages
2012/08/02
[#46973] [ruby-trunk - Bug #6829][Open] Failure using Win32ole (happens in 1.8.7 and 1.9 — "mvanduyn (Mitch VanDuyn)" <mitch@...>
6 messages
2012/08/03
[#46974] [ruby-trunk - Bug #6830][Assigned] test failure test_constants(OpenSSL::TestConfig) [/ruby/test/openssl/test_config.rb:27] on Mac + homebrew — "kosaki (Motohiro KOSAKI)" <kosaki.motohiro@...>
17 messages
2012/08/04
[#46978] [ruby-trunk - Bug #6832][Open] Module#instance_method and Module#method_defined? act inconsistently w.r.t #respond_to_missing? — "myronmarston (Myron Marston)" <myron.marston@...>
6 messages
2012/08/04
[#46996] [ruby-trunk - Bug #6836][Assigned] Improve File.expand_path performance in Windows — "luislavena (Luis Lavena)" <luislavena@...>
15 messages
2012/08/04
[#47021] [ruby-trunk - Bug #6836] Improve File.expand_path performance in Windows
— "luislavena (Luis Lavena)" <luislavena@...>
2012/08/06
[#47045] [ruby-trunk - Bug #6836] Improve File.expand_path performance in Windows
— "h.shirosaki (Hiroshi Shirosaki)" <h.shirosaki@...>
2012/08/07
[#47036] [ruby-trunk - Feature #6841][Open] Shorthand for Assigning Return Value of Method to Self — "wardrop (Tom Wardrop)" <tom@...>
18 messages
2012/08/07
[#52968] [ruby-trunk - Feature #6841] Shorthand for Assigning Return Value of Method to Self
— "wardrop (Tom Wardrop)" <tom@...>
2013/02/27
[#47050] [ruby-trunk - Feature #6842][Open] Add Optional Arguments to String#strip — "wardrop (Tom Wardrop)" <tom@...>
10 messages
2012/08/07
[#47091] [ruby-trunk - Feature #6847][Open] Hash#extract — "citizen428 (Michael Kohl)" <citizen428@...>
10 messages
2012/08/09
[#47094] [ruby-trunk - Bug #6849][Open] Psych.load_file throws TypeError for empty file — "BrandonMathis (Brandon Mathis)" <BeMathis@...>
4 messages
2012/08/09
[#47103] [ruby-trunk - Bug #6851][Open] Result of File.stat("c:/...") is different from 1.9.3 — "phasis68 (Heesob Park)" <phasis@...>
8 messages
2012/08/10
[#47108] [ruby-trunk - Feature #6852][Open] [].transpose should behave specially — "boris_stitnicky (Boris Stitnicky)" <boris@...>
13 messages
2012/08/10
[#47138] [ruby-trunk - Bug #6861][Open] ERB::Util.escape_html is not escaping single quotes — "spastorino (Santiago Pastorino)" <santiago@...>
14 messages
2012/08/12
[#47199] [ruby-trunk - Bug #6872][Open] Array does not specify how it determines uniqueness of values — "agrimm (Andrew Grimm)" <andrew.j.grimm@...>
8 messages
2012/08/15
[#47243] [ruby-trunk - Feature #6895][Open] TracePoint API — "ko1 (Koichi Sasada)" <redmine@...>
27 messages
2012/08/20
[#47277] [ruby-trunk - Feature #6895] TracePoint API
— "trans (Thomas Sawyer)" <transfire@...>
2012/08/22
[#47254] [ruby-trunk - Feature #6895] TracePoint API
— "trans (Thomas Sawyer)" <transfire@...>
2012/08/20
[#47257] Re: [ruby-trunk - Feature #6895] TracePoint API
— SASADA Koichi <ko1@...>
2012/08/21
(2012/08/21 6:11), trans (Thomas Sawyer) wrote:
[#47287] [ruby-trunk - Feature #6910][Assigned] Loading syck's broken yaml with psych — "naruse (Yui NARUSE)" <naruse@...>
5 messages
2012/08/23
[#47309] [ruby-trunk - Bug #6929][Open] Documentation for Ripper — "zzak (Zachary Scott)" <zachary@...>
16 messages
2012/08/25
[#47322] Re: [ruby-cvs:43987] luislavena:r36811 (trunk): Improve require/File.expand_path performance on Windows — Urabe Shyouhei <shyouhei@...>
Hello Luis,
4 messages
2012/08/27
[#47345] [ruby-trunk - Feature #6946][Open] FIPS support? — "vo.x (Vit Ondruch)" <v.ondruch@...>
35 messages
2012/08/28
[#51002] [ruby-trunk - Feature #6946] FIPS support?
— "MartinBosslet (Martin Bosslet)" <Martin.Bosslet@...>
2012/12/20
[#51004] Re: [ruby-trunk - Feature #6946] FIPS support?
— SASADA Koichi <ko1@...>
2012/12/20
After that, I got the following error.
[#51006] Re: [ruby-trunk - Feature #6946] FIPS support?
— Martin Bo煬et <martin.bosslet@...>
2012/12/20
2012/12/20 SASADA Koichi <[email protected]>
[#47350] No tag for 1.8.7p370 on Github? — Charles Oliver Nutter <headius@...>
I was about to update JRuby's 1.8.7 stdlib, but there's no tag for
3 messages
2012/08/28
[#47367] [ruby-trunk - Bug #6950][Open] ruby-mode: comint-previous-input does not work — "cinsk (Seong-Kook Shin)" <cinsky@...>
6 messages
2012/08/30
[#47369] [ruby-trunk - Bug #6950] ruby-mode: comint-previous-input does not work
— "drbrain (Eric Hodel)" <[email protected]>
2012/08/30
[ruby-core:47181] [ruby-trunk - Feature #5663] Combined map/select method
From:
"drKreso (Kresimir Bojcic)" <kresimir.bojcic@...>
Date:
2012-08-14 09:24:28 UTC
List:
ruby-core #47181
Issue #5663 has been updated by drKreso (Kresimir Bojcic).
+1 I also like filter_map
(My other favourite would be map_selected which I think is more expressive for non-lisp-brainwashed)
----------------------------------------
Feature #5663: Combined map/select method
https://bugs.ruby-lang.org/issues/5663#change-28862
Author: wycats (Yehuda Katz)
Status: Feedback
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: lib
Target version: 2.0.0
It is pretty common to want to map over an Enumerable, but only include the elements that match a particular filter. A common idiom is:
enum.map { |i| i + 1 if i.even? }.compact
It is of course also possible to do this with two calls:
enum.select { |i| i.even? }.map { |i| i + 1 }
Both cases are clumsy and require two iterations through the loop. I'd like to propose a combined method:
enum.map_select { |i| i + 1 if i.even? }
The only caveat is that it would be impossible to intentionally return nil here; suggestions welcome. The naming is also a strawman; feel free to propose something better.
--
http://bugs.ruby-lang.org/