[#51329] [ruby-trunk - Feature #7677][Open] YAML load mode that does instantiate Ruby — "trans (Thomas Sawyer)" <transfire@...>
7 messages
2013/01/09
[#51347] [ruby-trunk - Bug #7679][Open] IRB history is broken — "zzak (Zachary Scott)" <zachary@...>
15 messages
2013/01/10
[#51348] [ruby-trunk - Bug #7680][Open] IRB autocompletion doesn't autocomplete methods — "zzak (Zachary Scott)" <zachary@...>
8 messages
2013/01/10
[#51389] [ruby-trunk - Bug #7688][Open] Error hiding with rb_rescue() on Comparable#==, #coerce and others — "Eregon (Benoit Daloze)" <redmine@...>
34 messages
2013/01/11
[#59674] [ruby-trunk - Feature #7688] Error hiding with rb_rescue() on Comparable#==, #coerce and others
— "marcandre (Marc-Andre Lafortune)" <ruby-core@...>
2014/01/09
[#59675] [ruby-trunk - Feature #7688] Error hiding with rb_rescue() on Comparable#==, #coerce and others
— "marcandre (Marc-Andre Lafortune)" <ruby-core@...>
2014/01/09
[#59679] Re: [ruby-trunk - Feature #7688] Error hiding with rb_rescue() on Comparable#==, #coerce and others
— "Martin J. Dürst" <duerst@...>
2014/01/10
On 2014/01/10 7:42, marcandre (Marc-Andre Lafortune) wrote:
[#51391] [ANN] Implementer Meeting — Aaron Patterson <tenderlove@...>
Hey everyone,
9 messages
2013/01/11
[#51421] Re: [ANN] Implementer Meeting
— Mark Rada <markrada26@...>
2013/01/14
Hello Aaron,
[#51431] Re: [ANN] Implementer Meeting
— Marc-Andre Lafortune <ruby-core-mailing-list@...>
2013/01/14
I'm worried about issues with Enumerator::Lazy. Should we discuss this at
[#51399] [ruby-trunk - Bug #7689][Open] Crash @enumerator.so with ruby 1.9.3/thin/RoR 3.2.11 — "saepia (Marcin Lewandowski)" <marcin@...>
6 messages
2013/01/12
[#51441] [ruby-trunk - Bug #7699][Open] rubyspec failed: BigDecimal#divmod Can be reversed with * and + — "mrkn (Kenta Murata)" <muraken@...>
8 messages
2013/01/15
[#51453] [REMINDER] Implemeter Meeting — Aaron Patterson <tenderlove@...>
Hey everyone,
5 messages
2013/01/15
[#51454] [CommonRuby - Feature #7701][Open] Non-optional (required) keyword args — "headius (Charles Nutter)" <headius@...>
31 messages
2013/01/15
[#53256] [CommonRuby - Feature #7701] Non-optional (required) keyword args
— "headius (Charles Nutter)" <headius@...>
2013/03/09
[#51496] Ruby 2.0 Meeting Schedule — Aaron Patterson <tenderlove@...>
At the Implemeters Meeting, we talked about meeting again in 2 weeks
5 messages
2013/01/17
[#51497] Schedule next developer meeting — Aaron Patterson <tenderlove@...>
At the last meeting, we agreed upon having another meeting four weeks
5 messages
2013/01/17
[#51499] [ruby-trunk - Feature #7712][Open] Add .txt extensions to all plain-text documentation files for Windows users — "postmodern (Hal Brodigan)" <postmodern.mod3@...>
9 messages
2013/01/18
[#51545] Haiku port problem — Paulo Geyer <paulogeyer@...>
I'm trying to port ruby 1.9.3-p347 to Haiku (http://www.haiku-os.org/)
5 messages
2013/01/21
[#51578] [ruby-trunk - Bug #7729][Open] __dir__ returns a absolute dir path — "authorNari (Narihiro Nakamura)" <authorNari@...>
8 messages
2013/01/23
[#51623] [ruby-trunk - Feature #7739][Open] Define Hash#| as Hash#reverse_merge in Rails — "alexeymuranov (Alexey Muranov)" <redmine@...>
24 messages
2013/01/24
[#51726] [ruby-trunk - Feature #7751][Open] How to encapsulate File.delete and File.rename into one 'transaction'? — "mghomn (Justin Peal)" <yujianbin@...>
5 messages
2013/01/29
[#51735] [ruby-trunk - Bug #7752][Open] Rational/Float/Fixnum/Bignum `.to_s.encoding` is US-ASCII — "coffeejunk (Maximilian Haack)" <mxhaack@...>
6 messages
2013/01/29
[ruby-core:51622] [ruby-trunk - Feature #7738] Deprecate Set#+ as an alias of Set#|, use it for symmetric difference. Introduce Hash#| for Hash#reverse_merge in Rails.
From:
"alexeymuranov (Alexey Muranov)" <redmine@...>
Date:
2013-01-24 12:53:16 UTC
List:
ruby-core #51622
Issue #7738 has been updated by alexeymuranov (Alexey Muranov).
Sorry for not being clear. The symmetric difference of A and B is the set of all those elements which belong to exactly one of the two sets A or B. It is like the bitwise "exclusive or".
Ok, i'll open a separate issue for `Hash#|`.
----------------------------------------
Feature #7738: Deprecate Set#+ as an alias of Set#|, use it for symmetric difference. Introduce Hash#| for Hash#reverse_merge in Rails.
https://bugs.ruby-lang.org/issues/7738#change-35582
Author: alexeymuranov (Alexey Muranov)
Status: Open
Priority: Normal
Assignee:
Category:
Target version: Next Major
=begin
I am almost sure this will be rejected, but i want to try anyway. My goal is to propose a more efficient and consistent use of binary operator symbols for some classes, in this case for (({Set})) and (({Hash})).
I propose to deprecate (({Set#+})) as an alias of (({Set#|})), and use (({Set#+})) later for the ((*symmetric difference*)) of sets. I think that operator symbols like (({+})) and (({|})) are too precious to alias one another.
Currently (({Set#+})) is probably the only use of (({#+})) for an operation which is not ((*injective*)) in each of the arguments: for sets (({a})), (({b})), (({c})), the equality
a + b == a + c
does not currently imply
b == c
The natural binary operation on sets that is injective in each argument is the ((*symmetric difference*)), it corresponds to the bitwise XOR. I have also noticed that the "(({+}))" for sets is used in "Lectures on ergodic theory " by P. Halmos to denote the symmetric difference.
I also suggest for to define (({Hash#|})) as Hash#reverse_merge in Rails, in my opinion this would correspond nicely to (({Set#|})).
=end
--
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