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194 lines
5.1 KiB
Text
194 lines
5.1 KiB
Text
# -*- rdoc -*-
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= NEWS for Ruby 2.7.0
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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 reference
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information is supplied with. For a full list of changes with all
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sufficient information, see the ChangeLog file or Redmine
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(e.g. <tt>https://bugs.ruby-lang.org/issues/$FEATURE_OR_BUG_NUMBER</tt>)
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== Changes since the 2.6.0 release
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=== Language changes
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* Pattern matching is introduced as an experimental feature. [Feature #14912]
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* Method reference operator, <code>.:</code> is introduced as an
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experimental feature. [Feature #12125] [Feature #13581]
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* Proc.new and proc with no block in a method called with a block is warned
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now.
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* lambda with no block in a method called with a block errs.
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* Non-Symbol keys in a keyword arguments hash were prohibited in 2.6.0,
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but are now allowed again. [Bug #15658]
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* Numbered parameter as the default block parameter is introduced as an
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experimental feature. [Feature #4475]
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* A beginless range is experimentally introduced. It might not be as useful
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as an endless range, but would be good for DSL purpose. [Feature #14799]
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ary[..3] # identical to ary[0..3]
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where(sales: ..100)
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* Setting <code>$;</code> to non-nil value is warned now. Use of it in
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String#split is warned too.
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* Setting <code>$,</code> to non-nil value is warned now. Use of it in
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Array#join is warned too.
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* Quoted here-document identifier must end within the same line.
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<<"EOS
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" # This has been warned since 2.4
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EOS
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=== Core classes updates (outstanding ones only)
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Enumerable::
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New method::
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* Added Enumerable#filter_map. [Feature #15323]
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* Added Enumerable#tally. [Feature #11076]
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Enumerator::
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New method::
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* Added Enumerator::Yielder#to_proc so that a Yielder object
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can be directly passed to another method as a block
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argument. [Feature #15618]
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FrozenError::
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New method::
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* Added FrozenError#receiver to return the frozen object that
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modification was attempted on. To set this object when raising
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FrozenError in Ruby code, pass it as the second argument to
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FrozenError.new.
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GC::
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New method::
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* Added GC.compact method for compacting the heap.
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This function compacts live objects in the heap so that fewer pages may
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be used, and the heap may be more CoW friendly. [Feature #15626]
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Details on the algorithm and caveats can be found here:
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https://bugs.ruby-lang.org/issues/15626
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Integer::
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Modified method::
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* Integer#[] now supports range operation. [Feature #8842]
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0b01001101[2, 4] #=> 0b0011
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0b01001100[2..5] #=> 0b0011
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0b01001100[2...6] #=> 0b0011
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^^^^
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Regexp / String::
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* Update Unicode version and Emoji version from 11.0.0 to
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12.0.0. [Feature #15321]
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* Update Unicode version to 12.1.0, adding support for
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U+32FF SQUARE ERA NAME REIWA. [Feature #15195]
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Time::
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* Added Time#ceil method. [Feature #15772]
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* Added Time#floor method. [Feature #15653]
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=== Stdlib updates (outstanding ones only)
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Bundler::
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* Upgrade to Bundler 2.1.0.pre.1
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Bundled from https://github.com/bundler/bundler/commit/a53709556b95a914e874b22ed2116a46b0528852
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CSV::
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* Upgrade to 3.0.9.
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See https://github.com/ruby/csv/blob/master/NEWS.md.
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Date::
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* Date.jisx0301, Date#jisx0301, and Date.parse support the new Japanese
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era. [Feature #15742]
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Delegator::
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* Object#DelegateClass accepts a block and module_evals it in the context
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of the returned class, similar to Class.new and Struct.new.
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ERB::
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* Prohibit marshaling ERB instance.
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IRB::
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* Introduce syntax highlight inspired by pry.gem to Binding#irb source lines,
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REPL input, and inspect output of some core-class objects.
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Net::IMAP::
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* Add Server Name Indication (SNI) support. [Feature #15594]
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RSS::
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* Upgrade to RSS 0.2.8.
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See https://github.com/ruby/rss/blob/master/NEWS.md.
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RubyGems::
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* Upgrade to RubyGems 3.1.0.pre1
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Bundled from https://github.com/rubygems/rubygems/commit/97b264f0fa248c864b6ee9a23d3ff1cdd217dddb
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=== Compatibility issues (excluding feature bug fixes)
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=== Stdlib compatibility issues (excluding feature bug fixes)
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profile.rb, Profiler__::
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* Removed from standard library. No one maintains it from Ruby 2.0.0.
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=== C API updates
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=== Implementation improvements
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JIT::
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* JIT-ed code is recompiled to less-optimized code when an optimization assumption is invalidated.
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* Method inlining is performed when a method is considered as pure.
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This optimization is still experimental and many methods are NOT considered as pure yet.
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* Default value of +--jit-max-cache+ is changed from 1,000 to 100
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* Default value of +--jit-min-calls+ is changed from 5 to 10,000
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=== Miscellaneous changes
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* Require compilers to support C99 [Misc #15347]
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* Details of our dialect: https://bugs.ruby-lang.org/projects/ruby-trunk/wiki/C99
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* Upstream repository is changed from Subversion to Git.
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* https://git.ruby-lang.org/ruby.git
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* RUBY_REVISION class is changed from Integer to String.
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* RUBY_DESCRIPTION includes Git revision instead of Subversion's one.
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