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284 строки
8.0 KiB
Plaintext
284 строки
8.0 KiB
Plaintext
# -*- rdoc -*-
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= NEWS for Ruby 2.6.0
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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 2.5.0 release
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=== Language changes
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* $SAFE is a process global state and we can set 0 again. [Feature #14250]
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* refinements take place at block passing. [Feature #14223]
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* `else` without `rescue` now causes a syntax error. [EXPERIMENTAL]
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* constant names may start with a non-ASCII capital letter. [Feature #13770]
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* An endless range is introduced. You can write a range that has no end, like `(0..)`.
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The following shows typical use cases. [Feature #12912]
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ary[1..] # identical to ary[1..-1]
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(1..).each {|index| ... } # infinite loop from index 1
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ary.zip(1..) {|elem, index| ... } # ary.each.with_index(1) { }
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=== Core classes updates (outstanding ones only)
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* Array
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* Aliased methods:
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* Array#filter is a new alias for Array#select [Feature #13784]
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* Array#filter! is a new alias for Array#select! [Feature #13784]
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* Binding
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* New methods:
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* added Binding#source_location. [Feature #14230]
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This method returns the source location of binding, a 2-element
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array of `__FILE__` and `__LINE__`. Traditionally, the same
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information could be retrieved by `eval("[__FILE__, __LINE__]",
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binding)`, but we are planning to change this behavior so that
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`Kernel#eval` ignores binding's source location [Bug #4352].
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So, users should use this newly-introduced method instead of
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`Kernel#eval`.
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* Dir
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* New methods:
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* added Dir#each_child and Dir#children instance methods. [Feature #13969]
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* Enumerable
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* Aliased methods:
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* Enumerable#filter is a new alias for Enumerable#select [Feature #13784]
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* Enumerator::Lazy
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* Aliased methods:
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* Enumerator::Lazy#filter is a new alias for Enumerator::Lazy#select [Feature #13784]
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* Exception
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* Exception#full_message takes :highlight and :order options [Bug #14324]
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* Hash
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* Aliased methods:
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* Hash#filter is a new alias for Hash#select [Feature #13784]
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* Hash#filter! is a new alias for Hash#select! [Feature #13784]
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* IO
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* new mode character 'x' to open files for exclusive access [Feature #11258]
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* Kernel
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* Kernel#then is a new alias for Kernel#yield_self [Feature #14594]
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* Kernel.#Complex takes :exception option to specify the way of error handling [Feature #12732]
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* Kernel.#Float takes :exception option to specify the way of error handling [Feature #12732]
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* Kernel.#Integer takes :exception option to specify the way of error handling [Feature #12732]
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* Kernel.#Rational takes :exception option to specify the way of error handling [Feature #12732]
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* Kernel.#system takes :exception option to raise an exception on
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failure. [Feature #14386]
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* KeyError
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* KeyError#initialize accepts :receiver and :key options to set receiver and key in Ruby code. [Feature #14313]
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* NameError
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* NameError#initialize accepts :receiver option to set receiver in Ruby code. [Feature #14313]
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* NoMethodError
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* NoMethodError#initialize accepts :receiver option to set receiver in Ruby code. [Feature #14313]
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* Proc
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* Proc#call doesn't change $SAFE any more. [Feature #14250]
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* Random
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* New methods:
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* added Random.bytes. [Feature #4938]
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* Range
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* Range#=== now uses #cover? instead of #include? method. [Feature #14575]
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* RubyVM::AST
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* RubyVM::AST.parse parses a given string and returns AST nodes. [experimental]
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* RubyVM::AST.parse_file parses a given file and returns AST nodes. [experimental]
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* String
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* String#split yields each substring to the block if given. [Feature #4780]
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* TracePoint
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* New methods:
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* TracePoint#parameters [Feature #14694]
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=== Stdlib updates (outstanding ones only)
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* ERB
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* Add :trim_mode and :eoutvar keyword arguments to ERB.new. Now non-keyword arguments other than first one
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are softly deprecated and will be removed when Ruby 2.5 becomes EOL. [Feature #14256]
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* erb command's -S option is deprecated, which will be removed in the next version.
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* FileUtils
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* New method:
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* FileUtils#cp_lr [Feature #4189]
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* Matrix
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* New method:
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* Matrix#antisymmetric?
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* Net
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* New method:
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* Add write_timeout keyword argument to Net::BufferedIO.new. [Feature #13396]
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* Add Net::BufferedIO#write_timeout, Net::BufferedIO#write_timeout=,
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Net::HTTP#write_timeout, and Net::HTTP#write_timeout=. [Feature #13396]
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* New constant:
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* Add Net::HTTPClientException to deprecate Net::HTTPServerException,
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whose name is misleading. [Bug #14688]
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* REXML
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* Improved some XPath implementations:
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* concat() function: Stringify all arguments before concatenating
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* string() function: Support context node
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* string() function: Support processing instruction node
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* Support "*:#{ELEMENT_NAME}" syntax in XPath 2.0
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* Fixed some XPath implementations:
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* "//#{ELEMENT_NAME}[#{POSITION}]" case
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* string() function: Fix function(document) returns nodes that are
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out of root elements.
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* "/ #{ELEMENT_NAME} " case
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* "/ #{ELEMENT_NAME} [ #{PREDICATE} ]" case
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* "/ #{AXIS}:: #{ELEMENT_NAME} " case
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* "#{N}-#{M}" case: One ore more white spaces were required before "-"
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* "/child::node()" case
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* "#{FUNCTION}()/#{PATH}" case
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* "@#{ATTRIBUTE}/parent::" case
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* "name(#{NODE_SET})" case
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* RSS
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* RSS::Parser.parse: Accept options as Hash. :validate,
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:ignore_unknown_element, :parser_class options are available.
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* Set
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* Aliased methods:
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* Set#filter! is a new alias for Set#select! [Feature #13784]
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* URI
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* Add URI::File to handle file URI scheme [Feature #14035]
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=== Compatibility issues (excluding feature bug fixes)
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* File
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* File.read, File.binread, File.write, File.binwrite, File.foreach,
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and File.readlines do not invoke external commands even if the path
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starts with the pipe character |. [Feature #14245]
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* Dir
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* Dir.glob with '\0'-separated pattern list will be deprecated, and
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is now warned. [Feature #14643]
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=== Stdlib compatibility issues (excluding feature bug fixes)
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=== C API updates
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=== Supported platform changes
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=== Implementation improvements
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* Speedup `Proc#call` because we don't need to care about `$SAFE` any more. [Feature #14318]
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With `lc_fizzbuzz` benchmark which uses so many `Proc#call` we can measure
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x1.4 improvements [Bug #10212].
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* Speedup `block.call` where `block` is passed block parameter. [Feature #14330]
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Ruby 2.5 improves block passing performance. [Feature #14045]
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Additionally, Ruby 2.6 improves the performance of passed block calling.
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* Introduce an initial implementation of JIT (Just-in-time) compiler. [Feature #14235] [experimental]
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* `--jit` option is added to enable JIT. `--jit-verbose=1` is good for inspection. See `ruby --help` for others.
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* This JIT relies on C compiler used to build Ruby, on runtime. Only gcc and clang are supported for the JIT
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for now, and MinGW support has some issues.
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* As of 2.6.0-preview1, we're just preparing infrastructure for JIT and very few optimizations are implemented.
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So it's not ready for benchmarking Ruby's JIT performance yet. It's known that current JIT enablement makes
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Rails application slower for now.
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* VM generator script renewal; makes the generated VM more optimized. [GH-1779]
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* Thread cache enabled for pthreads platforms
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(for `Thread.new` and `Thread.start`) [Feature #14757]
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=== Miscellaneous changes
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* On macOS, shared libraries no longer include a full version number of ruby in their names.
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This eliminates the burden of each teeny upgrade on the platform that users need to rebuild every extension library.
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* Before:
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* libruby.2.6.0.dylib
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* libruby.2.6.dylib -> libruby.2.6.0.dylib
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* libruby.dylib -> libruby.2.6.0.dylib
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* After:
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* libruby.2.6.dylib
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* libruby.dylib -> libruby.2.6.dylib
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