[#74190] [Ruby trunk Feature#12134] Comparison between `true` and `false` — duerst@...
SXNzdWUgIzEyMTM0IGhhcyBiZWVuIHVwZGF0ZWQgYnkgTWFydGluIETDvHJzdC4KCgpUc3V5b3No
3 messages
2016/03/07
[#74269] Type systems for Ruby — Rob Blanco <ml@...>
Dear ruby-core,
5 messages
2016/03/10
[#74395] [Ruby trunk Feature#12142] Hash tables with open addressing — shyouhei@...
Issue #12142 has been updated by Shyouhei Urabe.
3 messages
2016/03/17
[ruby-core:74275] Re: [Ruby trunk Feature#12165] Hash#first, Hash#last
From:
Jesús Burgos Maciá <jburmac@...>
Date:
2016-03-11 08:53:55 UTC
List:
ruby-core #74275
There's documentation for `#first`, you need to look for it in `Enumerable`, rather than `Hash`: http://docs.ruby-lang.org/en/2.3.0/Enumerable.html#method-i-first Enumerable lacks a `#last` method. I presume the main reason for that is because an enumerable object may not have a last element. On 10 March 2016 at 19:00, <[email protected]> wrote: > Issue #12165 has been reported by Fabian Stillhart. > > ---------------------------------------- > Feature #12165: Hash#first, Hash#last > https://bugs.ruby-lang.org/issues/12165 > > * Author: Fabian Stillhart > * Status: Open > * Priority: Normal > * Assignee: > ---------------------------------------- > Just run into a simple problem with a colleague and was wondering why > there is no Hash#last method? > > ~~~ruby > {a: true, b: false}.last > NoMethodError: undefined method 'last' for {:a=3D>true, :b=3D>false}:Hash > ~~~ > > Interestingly I while playing arround I found out that the Hash#first > method works. But why is it not in the ruby-doc? > > ~~~ruby > {a: true, b: false}.first > =3D> [:a, true] > ~~~ > > I would assume the Hash#last method would work like the Hash#first method= : > > ~~~ruby > {a: true, b: false}.last > =3D> [:b, false] > ~~~ > > If I am not wrong the order of a Hash is always the same when calling > Hash#each. So wouldn't it make sense to have Hash#last method? > > I tested it in Ruby 2.2.4 and Ruby 2.3.0. > > > > -- > https://bugs.ruby-lang.org/ > > Unsubscribe: <mailto:[email protected]?subject=3Dunsubscrib= e> > <http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core> > --=20 Jes=C3=BAs Burgos Maci=C3=A1 Unsubscribe: <mailto:[email protected]?subject=unsubscribe> <http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>