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231 lines
7 KiB
Text
231 lines
7 KiB
Text
# -*- rdoc -*-
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= NEWS for Ruby 2.4.0
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This document is a list of user visible feature changes made between
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releases except for bug fixes.
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Note that each entry is kept so brief that no reason behind or
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reference information is supplied with. For a full list of changes
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with all sufficient information, see the ChangeLog file or Redmine
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(e.g. <tt>https://bugs.ruby-lang.org/issues/$FEATURE_OR_BUG_NUMBER</tt>)
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== Changes since the 2.3.0 release
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=== Language changes
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* Multiple assignment in conditional expression is now allowed.
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[Feature #10617]
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=== Core classes updates (outstanding ones only)
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* Array
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* Array#max and Array#min. [Feature #12172]
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This may cause a tiny incompatibility: if you redefine
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Enumerable#max and call max to an Array, your redefinition will be
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now ignored. You should also redefine Array#max.
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* Array#sum [Feature #12217]
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This is different from Enumerable#sum in that Array#sum doesn't depend on
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the definition of each method.
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* Comparable
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* Comparable#clamp. [Feature #10594]
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* Dir
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* Dir.empty?. [Feature #10121]
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* Enumerable
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* Enumerable#sum [Feature #12217]
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* Enumerable#uniq [Feature #11090]
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* Enumerator::Lazy
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* Enumerator::Lazy#uniq [Feature #11090]
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* File
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* File.empty?. [Feature #9969]
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* Float
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* Float#ceil, Float#floor, and Float#truncate now take an optional
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digits, as well as Float#round. [Feature #12245]
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* Hash
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* Hash#transform_values and Hash#transform_values! [Feature #12512]
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* Integer
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* Integer#ceil, Integer#floor, and Integer#truncate now take an optional
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digits, as well as Integer#round. [Feature #12245]
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* Fixnum and Bignum are unified into Integer [Feature #12005]
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* Integer#digits for extracting columns of place-value notation [Feature #12447]
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* Kernel
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* Kernel#clone now takes an optional keyword argument, freeze flag.
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[Feature #12300]
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* MatchData
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* MatchData#named_captures [Feature #11999]
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* MatchData#values_at supports named captures [Feature #9179]
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* Module
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* Module.used_modules [Feature #7418]
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* Regexp
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* Regexp#match? [Feature #8110]
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This returns bool and doesn't save backref.
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* Regexp/String: Updated Unicode version from 8.0.0 to 9.0.0 [Feature #12513]
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* RubyVM::Env
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* RubyVM::Env was removed.
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* String
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* String#upcase, String#downcase, String#capitalize, String#swapcase and
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their bang variants work for all of Unicode, and are no longer limited
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to ASCII. Supported encodings are UTF-8, UTF-16BE/LE, UTF-32BE/LE, and
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ISO-8859-1~16. Variations are available with options. See the documentation
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of String#downcase for details. [Feature #10085]
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* String.new(capacity: size) [Feature #12024]
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* Symbol
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* Symbol#match now returns MatchData. [Bug #11991]
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* Symbol#upcase, Symbol#downcase, Symbol#capitalize, and Symbol#swapcase now
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work for all of Unicode. See the documentation of String#downcase
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for details. [Feature #10085]
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* Thread
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* Thread#report_on_exception and Thread.report_on_exception
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[Feature #6647]
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* Warning
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* New module named Warning is introduced. By default it has only
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one singleton method, also named warning. This makes it possible
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for 3rd-party libraries to control the way warnings are handled.
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[Feature #12299]
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=== Stdlib updates (outstanding ones only)
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* CGI
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* Don't allow , as a separator [Bug #12791]
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* CSV
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* Add a liberal_parsing option. [Feature #11839]
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* Logger
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* Allow specifying logger parameters in constructor such
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as level, progname, datetime_format, formatter. [Feature #12224]
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* Add shift_period_suffix option. [Feature #10772]
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* OpenSSL
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* OpenSSL is extracted as a gem and the upstream has been migrated to
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https://github.com/ruby/openssl. OpenSSL still remains as a default gem.
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Refer to its History.md for the full release note. [Feature #9612]
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* optparse
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* Add an into option. [Feature #11191]
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* WEBrick
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* Don't allow , as a separator [Bug #12791]
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=== Compatibility issues (excluding feature bug fixes)
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* Array#sum and Enumerable#sum are implemented. [Feature #12217]
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Ruby itself has no compatibility problem because Ruby didn't have sum method
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for arrays before Ruby 2.4.
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However many third party gems, activesupport, facets, simple_stats, etc,
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defines sum method. These implementations are mostly compatible but
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there are subtle differences.
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Ruby's sum method should be mostly compatible but it is impossible to
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be perfectly compatible with all of them.
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* Fixnum and Bignum are unified into Integer [Feature #12005]
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Fixnum class and Bignum class is removed.
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Integer class is changed from abstract class to concrete class.
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For example, 0 is an instance of Integer: 0.class returns Integer.
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The constants Fixnum and Bignum is bound to Integer.
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So obj.kind_of?(Fixnum) works as obj.kind_of?(Integer).
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At C-level, Fixnum object and Bignum object should be distinguished by
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FIXNUM_P(obj) and RB_TYPE_P(obj, T_BIGNUM).
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RUBY_INTEGER_UNIFICATION can be used to detect this feature at C-level.
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0.class == Integer can be used to detect this feature at Ruby-level.
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ruby-2.4.0-preview1 (temporally) removes rb_cFixnum and rb_cBignum
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to check the effect of incompatibility.
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(rb_cFixnum and rb_cBignum may be defined as rb_cInteger later if
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compilation failure of extension library is too big problem.)
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* String/Symbol#upcase/downcase/swapcase/capitalize(!) now work for all of
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Unicode, not only for ASCII. [Feature #10085]
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No change is needed if the data is in ASCII anyway or if the limitation
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to ASCII was only tolerated while waiting for a more extensive implementation.
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A change (using the :ascii option) is needed in cases where Unicode data
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is processed, but the operation has to be limited to ASCII only.
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A good example of this are internationalized domain names.
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=== Stdlib compatibility issues (excluding feature bug fixes)
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* DateTime
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* DateTime#to_time now preserves timezone. [Bug #12189]
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* Time
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* Time#to_time now preserves timezone. [Bug #12271]
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* thread
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* the extension library is removed. Till 2.0 it was a pure ruby script
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"thread.rb", which has precedence over "thread.so", and has been provided
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in $LOADED_FEATURES since 2.1.
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* Tk
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* Tk is removed from stdlib. [Feature #8539]
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https://github.com/ruby/tk is the new upstream.
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=== C API updates
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* ruby_show_version() will no longer exits the process, if
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RUBY_SHOW_COPYRIGHT_TO_DIE is set to 0. This will be the default in
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the future.
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=== Supported platform changes
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* FreeBSD < 4 is no longer supported
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=== Implementation improvements
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* In some condition, `[x, y].max` and `[x, y].min` are optimized
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so that a temporal array is not created. The concrete condition is
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an implementation detail: currently, the array literal must have no
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splat, must have at least one expression but literal, the length must
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be <= 0x100, and Array#max and min must not be redefined. It will work
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in most casual and real-life use case where it is written with intent
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to `Math.max(x, y)`.
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* Thread deadlock detection now shows their backtrace and dependency. [Feature #8214]
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