[#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:51620] [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:
"trans (Thomas Sawyer)" <transfire@...>
Date:
2013-01-24 12:20:47 UTC
List:
ruby-core #51620
Issue #7738 has been updated by trans (Thomas Sawyer).
It would help if you gave some examples of what "symmetric difference" actually meant.
Put the last "I also suggest" in another issue. Ok?
----------------------------------------
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-35579
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
--
http://bugs.ruby-lang.org/