[#55222] [ruby-trunk - Feature #8468][Feedback] Remove $SAFE — "shugo (Shugo Maeda)" <redmine@...>

20 messages 2013/06/01

[#55260] [ruby-trunk - Feature #8478][Open] The hash returned by Enumerable#group_by should have an empty array for its default value — "phiggins (Pete Higgins)" <pete@...>

8 messages 2013/06/02

[#55276] Re: [ruby-changes:28951] zzak:r41003 (trunk): * process.c: Improve Process::exec documentation — Tanaka Akira <akr@...>

2013/5/31 zzak <[email protected]>:

9 messages 2013/06/03

[#55306] [ruby-trunk - Feature #8490][Open] Bring ActiveSupport Enumerable#index_by to core — "rosenfeld (Rodrigo Rosenfeld Rosas)" <rr.rosas@...>

12 messages 2013/06/04

[#55330] [ruby-trunk - Feature #8499][Assigned] Importing Hash#slice, Hash#slice!, Hash#except, and Hash#except! from ActiveSupport — "mrkn (Kenta Murata)" <muraken@...>

30 messages 2013/06/06

[#55391] [ruby-trunk - Bug #8507][Open] Keyword splat does not convert arg to Hash — "stephencelis (Stephen Celis)" <stephen.celis@...>

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[#55393] [ruby-trunk - Bug #8508][Open] Invalid byte sequence in UTF-8 (ArgumentError) in win32/registry.rb — "thasmo (Thomas Deinhamer)" <thasmo@...>

11 messages 2013/06/09

[#55528] [ruby-trunk - Bug #8538][Open] c method not pushed into the callstack when called, but popped when returned — deivid (David Rodríguez) <deivid.rodriguez@...>

9 messages 2013/06/17

[#55557] [ruby-trunk - misc #8543][Open] rb_iseq_load — "alvoskov (Alexey Voskov)" <alvoskov@...>

47 messages 2013/06/19

[#55558] [ruby-trunk - Feature #8544][Open] OpenURI should open 'file://' URIs — "silasdavis (Silas Davis)" <ruby-lang@...>

12 messages 2013/06/19

[#55580] [CommonRuby - Feature #8556][Open] MutexedDelegator as a trivial way to make an object thread-safe — "headius (Charles Nutter)" <headius@...>

19 messages 2013/06/21

[#55596] [ruby-trunk - Feature #8563][Open] Instance variable arguments — "sawa (Tsuyoshi Sawada)" <sawadatsuyoshi@...>

18 messages 2013/06/22

[#55638] [CommonRuby - Feature #8568][Open] Introduce RbConfig value for native word size, to avoid Fixnum#size use — "headius (Charles Nutter)" <headius@...>

18 messages 2013/06/24

[#55678] [ruby-trunk - Feature #8572][Open] Fiber should be a Enumerable — "mattn (Yasuhiro Matsumoto)" <mattn.jp@...>

13 messages 2013/06/28

[#55699] [ruby-trunk - Feature #8579][Open] Frozen string syntax — "charliesome (Charlie Somerville)" <charliesome@...>

20 messages 2013/06/29

[#55708] [ruby-trunk - Bug #8584][Assigned] Remove curses — "shugo (Shugo Maeda)" <redmine@...>

17 messages 2013/06/30

[ruby-core:55260] [ruby-trunk - Feature #8478][Open] The hash returned by Enumerable#group_by should have an empty array for its default value

From: "phiggins (Pete Higgins)" <pete@...>
Date: 2013-06-02 19:37:48 UTC
List: ruby-core #55260
Issue #8478 has been reported by phiggins (Pete Higgins).

----------------------------------------
Feature #8478: The hash returned by Enumerable#group_by should have an empty array for its default value
https://bugs.ruby-lang.org/issues/8478

Author: phiggins (Pete Higgins)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 


Without this patch, nil checks might need to be done on the return value of Enumerable#group_by:

$ cat test_group_by.rb 
a = [1, 2, 3, "a", "b"]
g = a.group_by {|o| o.class }

puts "Fixnums: #{g[Fixnum].size}"
puts "Strings: #{g[String].size}"
puts "Arrays: #{g[Array].size}"

$ ruby test_group_by.rb 
Fixnums: 3
Strings: 2
test_group_by.rb:6:in `<main>': undefined method `size' for nil:NilClass (NoMethodError)

This patch adds a default value of an empty array to the hash returned by Enumerable#group_by, so the script above will work:

$ ./ruby -I.:lib test_group_by.rb 
Fixnums: 3
Strings: 2
Arrays: 0



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