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Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 491 |
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@@ -1,491 +0,0 @@ -# -*- rdoc -*- - -= 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. <tt>https://bugs.ruby-lang.org/issues/$FEATURE_OR_BUG_NUMBER</tt>) - -== Changes since the 2.5.0 release - -=== Language changes - -* <code>$SAFE</code> 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 <code>(0..)</code>. 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. - -* "shadowing outer local variable" warning was removed. [Feature #12490] - You can now write the following without warning. - - user = users.find {|user| cond(user) } - -* Print exception backtrace and error message in reverse order when the - exception is not caught and STDOUT is unchanged and a tty. [Feature #8661] - -* Print `cause` of the exception if the exception is not caught and printed - its backtraces and error message [Feature #8257] - -=== Core classes updates (outstanding ones only) - -[Array] - - [New methods] - - * Added Array#union and Array#difference instance methods. [Feature #14097] - - [Modified methods] - - * Array#to_h now maps elements to new keys and values by the - block if given. [Feature #15143] - - [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 the binding, a 2-element - array of <code>__FILE__</code> and <code>__LINE__</code>. - Traditionally, the same information could be retrieved by - <code>eval("[__FILE__, __LINE__]", binding)</code>, 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] - - [Modified methods] - - * Enumerable#to_h now maps elements to new keys and values by the block if - given. [Feature #15143] - - [Aliased methods] - - * Enumerable#filter is a new alias for Enumerable#select. [Feature #13784] - -[Enumerator::ArithmeticSequence] - - * This is a new class to represent a generator of an arithmetic sequence, - that is a number sequence defined by a common difference. It can be used - for representing what is similar to Python's slice. You can get an - instance of this class from Numeric#step and Range#step. - -[Enumerator::Lazy] - - [Aliased methods] - - * Enumerator::Lazy#filter is a new alias for - Enumerator::Lazy#select. [Feature #13784] - -[ENV] - - [Modified methods] - - * ENV.to_h now maps names and values to new keys and values - by the block if given. [Feature #15143] - -[Exception] - - [New options] - - * Exception#full_message takes +:highlight+ and +:order+ - options. [Bug #14324] - -[Hash] - - [Modified methods] - - * Hash#merge, merge!, and update now accept multiple - arguments. [Feature #15111] - - * Hash#to_h now maps keys and values to new keys and values - by the block if given. [Feature #15143] - - [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 <code>'x'</code> 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] - - * Kernel#system and Kernel#exec do not close non-standard file descriptors - (The default of the +:close_others+ option is changed to +false+, - 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 accept 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] - -[Numeric] - - [Incompatible changes] - - * Numeric#step now returns an instance of Enumerator::ArithmeticSequence - class rather than one of Enumerator class. - -[Proc] - - [Incompatible changes] - - * Proc#call doesn't change <code>$SAFE</code> any more. [Feature #14250] - -[Random] - - [New methods] - - * added Random.bytes. [Feature #4938] - -[Range] - - [New methods] - - * Added Range#% instance method. [Feature #14697] - - [Incompatible changes] - - * Range#=== now uses +#cover?+ instead of +#include?+ method. [Feature #14575] - * Range#cover? now accepts Range object. [Feature #14473] - * Range#step now returns an instance of Enumerator::ArithmeticSequence - class rather than one of Enumerator class. - -[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] - -[Struct] - - [Modified methods] - - * Struct#to_h now maps keys and values to new keys and values - by the block if given. [Feature #15143] - - [Aliased method] - - * Struct#filter is a new alias for Struct#select [Feature #13784] - -[Time] - - [New features] - - * Time.new and Time#getlocal accept a timezone object as well as - UTC offset string. Time#+, Time#- and Time#succ also preserve - the timezone. [Feature #14850] - -[TracePoint] - - [New methods] - - * TracePoint#parameters [Feature #14694] - -=== Stdlib updates (outstanding ones only) - -[Coverage] - - A oneshot_lines mode is added. [Feature #15022] - This mode checks "whether each line was executed at least once or not", - instead of "how many times each line was executed". - A hook for each line is fired at most once, and after it is fired - the hook flag is removed, i.e., it runs with zero overhead. - - [New options] - - * Add +:oneshot_lines+ keyword argument to Coverage.start. - - * Add +:stop+ and +:clear+ keyword arguments to Coverage.result. - If +clear+ is true, it clears the counters to zero. - If +stop+ is true, it disables coverage measurement. - - [New methods] - - * Coverage.line_stub, which is a simple helper function that - creates the "stub" of line coverage from a given source code. - -[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 <tt>-S</tt> option is deprecated, which will be removed - in the next version. - -[FileUtils] - - [New methods] - - * FileUtils#cp_lr. [Feature #4189] - -[Matrix] - - [New methods] - - * Matrix#antisymmetric? / #skew_symmetric? - - * Matrix#map! / #collect! [Feature #14151] - - * Matrix#[]= - - * Vector#map! / #collect! - - * Vector#[]= - -[Net] - - [New options] - - * Add +:write_timeout+ keyword argument to Net::HTTP.new. [Feature #13396] - - [New methods] - - * Add 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] - - * <code>concat()</code> function: Stringify all arguments before concatenating - - * <code>string()</code> function: Support context node - - * <code>string()</code> function: Support processing instruction node - - * Support <code>"*:#{ELEMENT_NAME}"</code> syntax in XPath 2.0 - - [Fixed some XPath implementations] - - * <code>"//#{ELEMENT_NAME}[#{POSITION}]"</code> case - - * <code>string()</code> function: Fix <code>function(document)</code> - returns nodes that are out of root elements. - - * <code>"/ #{ELEMENT_NAME} "</code> case - - * <code>"/ #{ELEMENT_NAME} [ #{PREDICATE} ]"</code> case - - * <code>"/ #{AXIS}::#{ELEMENT_NAME}"</code> case - - * <code>"#{N}-#{M}"</code> case: One or more white spaces were required - before <code>"-"</code> - - * <code>"/child::node()"</code> case - - * <code>"#{FUNCTION}()/#{PATH}"</code> case - - * <code>"@#{ATTRIBUTE}/parent::"</code> case - - * <code>"name(#{NODE_SET})"</code> 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] - -[Bundler] - - * Add Bundler to Standard Library. [Feature #12733] - - * Use 1.17.1. It's latest stable version. - -=== 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 <code>'|'</code>. [Feature #14245] - -[Dir] - - * Dir.glob with <code>'\0'</code>-separated pattern list will be deprecated, - and is now warned. [Feature #14643] - -=== Stdlib compatibility issues (excluding feature bug fixes) - -* These standard libraries have been promoted to default gems. - - * e2mmap - * forwardable - * irb - * logger - * matrix - * mutex_m - * ostruct - * prime - * rexml - * rss - * shell - * sync - * thwait - * tracer - -=== C API updates - -=== Supported platform changes - -=== Implementation improvements - -* Speedup Proc#call because we don't need to care about <code>$SAFE</code> - 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] - - * <tt>--jit</tt> command line option is added to enable JIT. <tt>--jit-verbose=1</tt> - is good for inspection. See <tt>ruby --help</tt> for others. - * To generate machine code, this JIT compiler uses C compiler used for building - the interpreter. Currently GCC, Clang, and Microsoft Visual C++ are supported for it. - * <tt>--disable-mjit-support</tt> option is added to configure. This is added for JIT debugging, - but if you get an error on building a header file for JIT, you can use this option to skip - building it as a workaround. - * rb_waitpid reimplemented on Unix-like platforms to maintain - compatibility with processes created for JIT [Bug #14867] - -* 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] - -* timer thread is eliminated for platforms with POSIX timers [Misc #14937] - -* Transient Heap (theap) is supported. [Bug #14858] [Feature #14989] - theap is managed heap for short-living memory objects. For example, - making small and short-living Hash object is x2 faster. With rdoc benchmark, - we maesured 6-7% performance improvement. - -=== 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 - -=== Misc - -* Extracted misc/*.el files to https://github.com/ruby/elisp |