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-- markdown -- markup: Markdown

NEWS for Ruby 2.6.0

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. https://bugs.ruby-lang.org/issues/$FEATURE_OR_BUG_NUMBER)

Changes since the 2.5.0 release

Language changes

  • $SAFE is a process global state and we can set 0 again. [Feature #14250]

  • refinements take place at block passing. [Feature #14223]

  • else without rescue now causes a syntax error. [EXPERIMENTAL]

  • constant names may start with a non-ASCII capital letter. [Feature #13770]

  • An endless range is introduced. You can write a range that has no end, like (0..). The following shows typical use cases. [Feature #12912]

    ary[1..]                            # identical to ary[1..-1]
(1..).each {|index| ... }           # infinite loop from index 1
ary.zip(1..) {|elem, index| ... }   # ary.each.with_index(1) { }

  • Non-Symbol key in keyword arguments hash causes an exception.

Core classes updates (outstanding ones only)

  • Array

    • Aliased methods:

      • Array#filter is a new alias for Array#select. [Feature #13784]
      • Array#filter! is a new alias for Array#select!. [Feature #13784]

  • Binding

    • New methods:

      • added Binding#source_location. [Feature #14230]

        This method returns the source location of binding, a 2-element array of __FILE__ and __LINE__. Traditionally, the same information could be retrieved by eval("[__FILE__, __LINE__]", binding), but we are planning to change this behavior so that Kernel#eval ignores binding's source location [Bug #4352]. So, users should use this newly-introduced method instead of Kernel#eval.

  • Dir

    • New methods:

      • added Dir#each_child and Dir#children instance methods. [Feature #13969]

  • Enumerable

    • Aliased methods:

      • Enumerable#filter is a new alias for Enumerable#select. [Feature #13784]

  • Enumerator::Lazy

    • Aliased methods:

      • Enumerator::Lazy#filter is a new alias for Enumerator::Lazy#select. [Feature #13784]

  • Exception

    • New options:

      • Exception#full_message takes :highlight and :order options. [Bug #14324]

  • Hash

    • Aliased methods:

      • Hash#filter is a new alias for Hash#select. [Feature #13784]

      • Hash#filter! is a new alias for Hash#select!. [Feature #13784]

  • IO

    • New options:

      • new mode character 'x' to open files for exclusive access. [Feature #11258]

  • Kernel

    • Aliased methods:

      • Kernel#then is a new alias for Kernel#yield_self. [Feature #14594]

    • New options:

      • Kernel.#Complex, Kernel.#Float, Kernel.#Integer and Kernel.#Rational take :exception option to specify the way of error handling. [Feature #12732]

      • Kernel.#system takes :exception option to raise an exception on failure. [Feature #14386]

    • Incompatible changes:

      • system() and exec() do not close non-standard file descriptors (The default of :close_others option is changed to false by default. but we still set the FD_CLOEXEC flag on descriptors we create). [Misc #14907]

  • KeyError

    • New options:

      • KeyError#initialize accepts :receiver and :key options to set receiver and key in Ruby code. [Feature #14313]

  • Module

    • New methods:

      • Module#method_defined?, Module#private_method_defined? and Module#protected_method_defined? now accepts the second parameter as optional. If it's true (=default), checks ancestor modules/classes, or checks only the class itself. [Feature #14944]

  • NameError

    • New options:

      • NameError#initialize accepts :receiver option to set receiver in Ruby code. [Feature #14313]

  • NoMethodError

    • New options:

      • NoMethodError#initialize accepts :receiver option to set receiver in Ruby code. [Feature #14313]

  • Proc

    • Incompatible changes:

      • Proc#call doesn't change $SAFE any more. [Feature #14250]

  • Random

    • New methods:

      • added Random.bytes. [Feature #4938]

  • Range

    • Incompatible changes:

      • Range#=== now uses #cover? instead of #include? method. [Feature #14575]

  • RubyVM::AST

    • New methods:

      • RubyVM::AST.parse parses a given string and returns AST nodes. [experimental]

      • RubyVM::AST.parse_file parses a given file and returns AST nodes. [experimental]

  • String

    • New features:

      • String#split yields each substring to the block if given. [Feature #4780]

  • TracePoint

    • New methods:

      • TracePoint#parameters [Feature #14694]

Stdlib updates (outstanding ones only)

  • ERB

    • New options:

      • Add :trim_mode and :eoutvar keyword arguments to ERB.new. Now non-keyword arguments other than first one are softly deprecated and will be removed when Ruby 2.5 becomes EOL. [Feature #14256]

      • erb command's -S option is deprecated, which will be removed in the next version.

  • FileUtils

    • New method:

      • FileUtils#cp_lr. [Feature #4189]

  • Matrix

    • New method:

      • Matrix#antisymmetric?

  • Net

    • New options:

      • Add :write_timeout keyword argument to Net::BufferedIO.new. [Feature #13396]

    • New methods:

      • Add Net::BufferedIO#write_timeout, Net::BufferedIO#write_timeout=, Net::HTTP#write_timeout, and Net::HTTP#write_timeout=. [Feature #13396]

    • New constant:

      • Add Net::HTTPClientException to deprecate Net::HTTPServerException, whose name is misleading. [Bug #14688]

  • REXML

    • Improved some XPath implementations:

      • concat() function: Stringify all arguments before concatenating

      • string() function: Support context node

      • string() function: Support processing instruction node

      • Support "*:#{ELEMENT_NAME}" syntax in XPath 2.0

    • Fixed some XPath implementations:

      • "//#{ELEMENT_NAME}[#{POSITION}]" case

      • string() function: Fix function(document) returns nodes that are out of root elements.

      • "/ #{ELEMENT_NAME} " case

      • "/ #{ELEMENT_NAME} [ #{PREDICATE} ]" case

      • "/ #{AXIS}:: #{ELEMENT_NAME} " case

      • "#{N}-#{M}" case: One or more white spaces were required before "-"

      • "/child::node()" case

      • "#{FUNCTION}()/#{PATH}" case

      • "@#{ATTRIBUTE}/parent::" case

      • "name(#{NODE_SET})" case

  • RSS

    • New options:

      • RSS::Parser.parse: Accept options as Hash. :validate, :ignore_unknown_element, :parser_class options are available.

  • Set

    • Aliased methods:

      • Set#filter! is a new alias for Set#select!. [Feature #13784]

  • URI

    • New constant:

      • Add URI::File to handle file URI scheme. [Feature #14035]

Compatibility issues (excluding feature bug fixes)

  • File

    • File.read, File.binread, File.write, File.binwrite, File.foreach, and File.readlines do not invoke external commands even if the path starts with the pipe character '|'. [Feature #14245]

  • Dir

    • Dir.glob with '\0'-separated pattern list will be deprecated, and is now warned. [Feature #14643]

Stdlib compatibility issues (excluding feature bug fixes)

C API updates

Supported platform changes

Implementation improvements

  • Speedup Proc#call because we don't need to care about $SAFE any more. [Feature #14318]

    With lc_fizzbuzz benchmark which uses so many Proc#call we can measure x1.4 improvements. [Bug #10212]

  • Speedup block.call where block is passed block parameter. [Feature #14330]

    Ruby 2.5 improves block passing performance. [Feature #14045]

    Additionally, Ruby 2.6 improves the performance of passed block calling.

  • Introduce an initial implementation of JIT (Just-in-time) compiler. [Feature #14235] [experimental]

    • --jit option is added to enable JIT. --jit-verbose=1 is good for inspection. See ruby --help for others.
    • This JIT relies on C compiler used to build Ruby, on runtime. Only gcc and clang are supported for the JIT for now, and MinGW support has some issues.
    • As of 2.6.0-preview1, we're just preparing infrastructure for JIT and very few optimizations are implemented. So it's not ready for benchmarking Ruby's JIT performance yet. It's known that current JIT enablement makes Rails application slower for now.

  • VM generator script renewal; makes the generated VM more optimized. [GH-1779]

  • Thread cache enabled for pthreads platforms (for Thread.new and Thread.start). [Feature #14757]

Miscellaneous changes

  • On macOS, shared libraries no longer include a full version number of ruby in their names. This eliminates the burden of each teeny upgrade on the platform that users need to rebuild every extension library.

    • Before:

      • libruby.2.6.0.dylib
      • libruby.2.6.dylib -> libruby.2.6.0.dylib
      • libruby.dylib -> libruby.2.6.0.dylib

    • After:

      • libruby.2.6.dylib
      • libruby.dylib -> libruby.2.6.dylib