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# -*- rdoc -*-
= NEWS for Ruby 2.4.0
This document is a list of user visible feature changes made between
releases except for bug fixes.
Note that each entry is kept so brief that no reason behind or
reference information is supplied with. For a full list of changes
with all sufficient information, see the ChangeLog file or Redmine
(e.g. <tt>https://bugs.ruby-lang.org/issues/$FEATURE_OR_BUG_NUMBER</tt>)
== Changes since the 2.3.0 release
=== Language changes
* Multiple assignment in conditional expression is now allowed.
[Feature #10617]
* Refinements is enabled at method by Symbol#to_proc. [Feature #9451]
* Refinements is enabled with Kernel#send and BasicObject#__send__.
[Feature #11476]
* Rescue modifier now applicable to method arguments.
[Feature #12686]
=== Core classes updates (outstanding ones only)
* Array
* Array#max and Array#min. [Feature #12172]
This may cause a tiny incompatibility: if you redefine
Enumerable#max and call max to an Array, your redefinition will be
now ignored. You should also redefine Array#max.
* Array#sum [Feature #12217]
This is different from Enumerable#sum in that Array#sum doesn't depend on
the definition of each method.
* Array#concat [Feature #12333]
Now takes multiple arguments.
* Comparable
* Comparable#clamp. [Feature #10594]
* Dir
* Dir.empty?. [Feature #10121]
* Enumerable
* Enumerable#sum [Feature #12217]
* Enumerable#uniq [Feature #11090]
* Enumerable#chunk called without a block now return an Enumerator
[Feature #2172]
* Enumerator::Lazy
* Enumerator::Lazy#chunk_while [GH-1186]
* Enumerator::Lazy#uniq [Feature #11090]
* File
* File.empty?. [Feature #9969]
* Float
* Float#ceil, Float#floor, and Float#truncate now take an optional
digits, as well as Float#round. [Feature #12245]
* Float#round now takes an optional keyword argument, half option, and
the default behavior is round-to-nearest-even now. [Bug #12548]
* Hash
* Hash#transform_values and Hash#transform_values! [Feature #12512]
* Hash#compact and Hash#compact! [Feature #11818]
* Integer
* Integer#ceil, Integer#floor, and Integer#truncate now take an optional
digits, as well as Integer#round. [Feature #12245]
* Fixnum and Bignum are unified into Integer [Feature #12005]
* Integer#digits for extracting columns of place-value notation [Feature #12447]
* Int#round now takes an optional keyword argument, half option, and the
default behavior is round-to-nearest-even now. [Bug #12548]
* IO
* IO#gets, IO#readline, IO#each_line, IO#readlines, IO.foreach now takes
an optional keyword argument, chomp flag. [Feature #12553]
* Kernel
* Kernel#clone now takes an optional keyword argument, freeze flag.
[Feature #12300]
* MatchData
* MatchData#named_captures [Feature #11999]
* MatchData#values_at supports named captures [Feature #9179]
* Module
* Module.used_modules [Feature #7418]
* Module#refine accepts a module as the argument now. [Feature #12534]
* Numeric
* Numeric#finite?, Numeric#infinite? [Feature #12039]
* Process
* Support CLOCK_MONOTONIC_RAW_APPROX, CLOCK_UPTIME_RAW, and
CLOCK_UPTIME_RAW_APPROX which are introduced by macOS 10.12.
* Rational
* Rational#round now takes an optional keyword argument, half option, and
the default behavior is round-to-nearest-even now. [Bug #12548]
* Regexp
* Regexp#match? [Feature #8110]
This returns bool and doesn't save backref.
* Regexp/String: Updated Unicode version from 8.0.0 to 9.0.0 [Feature #12513]
* RubyVM::Env
* RubyVM::Env was removed.
* String
* String#upcase, String#downcase, String#capitalize, String#swapcase and
their bang variants work for all of Unicode, and are no longer limited
to ASCII. Supported encodings are UTF-8, UTF-16BE/LE, UTF-32BE/LE, and
ISO-8859-1~16. Variations are available with options. See the documentation
of String#downcase for details. [Feature #10085]
* String.new(capacity: size) [Feature #12024]
* String#concat, String#prepend [Feature #12333]
Now takes multiple arguments.
* Symbol
* Symbol#match now returns MatchData. [Bug #11991]
* Symbol#upcase, Symbol#downcase, Symbol#capitalize, and Symbol#swapcase now
work for all of Unicode. See the documentation of String#downcase
for details. [Feature #10085]
* Thread
* Thread#report_on_exception and Thread.report_on_exception
[Feature #6647]
* TracePoint
* TracePoint#callee_id [Feature #12747]
* Warning
* New module named Warning is introduced. By default it has only
one singleton method, named warn. This makes it possible for
3rd-party libraries to control the way warnings are handled.
[Feature #12299]
=== Stdlib updates (outstanding ones only)
* CGI
* Don't allow , as a separator [Bug #12791]
* CSV
* Add a liberal_parsing option. [Feature #11839]
* IPAddr
* IPAddr#== and IPAddr#<=> no longer raise an exception if coercion fails.
[Bug #12799]
* IRB
* Binding#irb: Start a REPL session like `binding.pry` at r56624.
* Logger
* Allow specifying logger parameters in constructor such
as level, progname, datetime_format, formatter. [Feature #12224]
* Add shift_period_suffix option. [Feature #10772]
* Net::HTTP
* New method: Net::HTTP.post [Feature #12375]
* OpenSSL
* OpenSSL is extracted as a gem and the upstream has been migrated to
https://github.com/ruby/openssl. OpenSSL still remains as a default gem.
Refer to its History.md for the full release note. [Feature #9612]
* optparse
* Add an into option. [Feature #11191]
* pathname
* New method: Pathname#empty? [Feature #12596]
* Readline
* Readline.quoting_detection_proc and Readline.quoting_detection_proc=
[Feature #12659]
* set
* New methods: Set#compare_by_identity and Set#compare_by_identity?.
[Feature #12210]
* WEBrick
* Don't allow , as a separator [Bug #12791]
=== Compatibility issues (excluding feature bug fixes)
* Array#sum and Enumerable#sum are implemented. [Feature #12217]
Ruby itself has no compatibility problem because Ruby didn't have sum method
for arrays before Ruby 2.4.
However many third party gems, activesupport, facets, simple_stats, etc,
defines sum method. These implementations are mostly compatible but
there are subtle differences.
Ruby's sum method should be mostly compatible but it is impossible to
be perfectly compatible with all of them.
* Fixnum and Bignum are unified into Integer [Feature #12005]
Fixnum class and Bignum class is removed.
Integer class is changed from abstract class to concrete class.
For example, 0 is an instance of Integer: 0.class returns Integer.
The constants Fixnum and Bignum is bound to Integer.
So obj.kind_of?(Fixnum) works as obj.kind_of?(Integer).
At C-level, Fixnum object and Bignum object should be distinguished by
FIXNUM_P(obj) and RB_TYPE_P(obj, T_BIGNUM).
RUBY_INTEGER_UNIFICATION can be used to detect this feature at C-level.
0.class == Integer can be used to detect this feature at Ruby-level.
The C-level constants, rb_cFixnum and rb_cBignum, is removed.
They can cause compilation failure.
* String/Symbol#upcase/downcase/swapcase/capitalize(!) now work for all of
Unicode, not only for ASCII. [Feature #10085]
No change is needed if the data is in ASCII anyway or if the limitation
to ASCII was only tolerated while waiting for a more extensive implementation.
A change (using the :ascii option) is needed in cases where Unicode data
is processed, but the operation has to be limited to ASCII only.
A good example of this are internationalized domain names.
* TRUE / FALSE / NIL
These constants are now obsoleted. [Feature #12574]
Use true / false / nil resp. instead.
=== Stdlib compatibility issues (excluding feature bug fixes)
* DateTime
* DateTime#to_time now preserves timezone. [Bug #12189]
* RDoc
* Update RDoc 5.0.0
* RubyGems
* Update RubyGems 2.6.8
* shellwords
* Shellwords.shellwords (shellsplit) treats the backslash as escape
character only when followed by one of the following characters:
$ ` " \ <newline>
[Bug #10055]
* Time
* Time#to_time now preserves timezone. [Bug #12271]
* thread
* the extension library is removed. Till 2.0 it was a pure ruby script
"thread.rb", which has precedence over "thread.so", and has been provided
in $LOADED_FEATURES since 2.1.
* Tk
* Tk is removed from stdlib. [Feature #8539]
https://github.com/ruby/tk is the new upstream.
* XMLRPC
* XMLRPC is removed from stdlib. [Feature #12160][ruby-core:74239]
https://github.com/ruby/xmlrpc is the new upstream.
=== C API updates
* ruby_show_version() will no longer exits the process, if
RUBY_SHOW_COPYRIGHT_TO_DIE is set to 0. This will be the default in
the future.
* rb_gc_adjust_memory_usage() [Feature #12690]
=== Supported platform changes
* FreeBSD < 4 is no longer supported
=== Implementation improvements
* In some condition, `[x, y].max` and `[x, y].min` are optimized
so that a temporal array is not created. The concrete condition is
an implementation detail: currently, the array literal must have no
splat, must have at least one expression but literal, the length must
be <= 0x100, and Array#max and min must not be redefined. It will work
in most casual and real-life use case where it is written with intent
to `Math.max(x, y)`.
* Thread deadlock detection now shows their backtrace and dependency. [Feature #8214]
* st_table (st.c) internal data structure is improved. [Feature #12142]
=== Miscellaneous changes
* ChangeLog is removed from the repository.
It is generated from commit messages in Subversion by `make dist`.
Also note that now people should follow Git style commit message.
The template is written at
[Short (50 chars or less) summary of changes](https://git-scm.com/book/ch5-2.html).
[Feature #12283]
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