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148 строки
4.3 KiB
Plaintext
148 строки
4.3 KiB
Plaintext
# -*- 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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* 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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* 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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* 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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* 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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* String
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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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* 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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=== Stdlib updates (outstanding ones only)
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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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* optparse
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* Add an into option. [Feature #11191]
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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, rb_cFixnum and rb_cBignum is same as rb_cInteger.
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So, class based dispatch, such as klass == rb_cFixnum and
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klass == rb_cBignum, should be changed to FIXNUM_P(obj) and
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RB_TYPE_P(obj, T_BIGNUM).
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=== Stdlib compatibility issues (excluding feature bug fixes)
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* Time
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* Time#to_time now preserves timezone. [Bug #12271]
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* DateTime
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* DateTime#to_time now preserves timezone. [Bug #12189]
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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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=== 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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