NEWS for Ruby 2.3.0¶ ↑
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 2.2.0 release¶ ↑
Language changes¶ ↑
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frozen-string-literal pragma:
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new pragma, frozen-string-literal has been experimentally introduced. [Feature #8976]
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besides, –enable/–disable=frozen-string-literal options also have been introduced. [Feature #8976]
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command line options –debug or –debug=frozen-string-literal enable additional debugging mode which shows created location with at frozen object error (
RuntimeError). [Feature #11725]
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safe navigation operator:
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new method call syntax, ‘object&.foo’, method foo is called on ‘object’ if it is not nil. [Feature #11537]
This is similar to ‘try!’ in Active Support, except:
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method name is syntactically required
obj.try! {} # valid obj&. {} # syntax error -
arguments are evaluated only if a call is made:
obj.try!(:foo, bar()) # bar() is always evaluated obj&.foo(bar()) # bar() is conditionally evaluated
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attribute assignment is valid
obj&.attr += 1
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the did_you_mean gem:
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When a
NameErrororNoMethodErroroccurs because of a typo in the name, the did_you_mean gem automatically suggests other names similar to the method name."Yuki".starts_with?("Y") # => NoMethodError: undefined method `starts_with?' for "Yuki":String # Did you mean? start_with?
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indented here document:
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new string literal, here document starts with ‘<<~`. refer doc/syntax/literals.rdoc for more details. [Feature #9098]
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Core classes updates (outstanding ones only)¶ ↑
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ARGF.read_nonblocksupports ‘exception: false’ likeIO#read_nonblock. [Feature #11358]
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Array#bsearch_index[Feature #10730] -
Array#dig[Feature #11643]
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Comparable#==no longer rescues exceptions [Feature #7688]
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new Encoding::IBM037 (alias ebcdic-cp-us; dummy)
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Enumerable#grep_vis added as inverse version ofEnumerable#grep. [Feature #11049] -
Enumerable#chunk_while[Feature #10769]
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Enumerator::Lazy#grep_v[Feature #11773]
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File.mkfifo[Feature #11536] -
Add File::TMPFILE corresponding to O_TMPFILE
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Hash#fetch_values[Feature #10017] -
Hash#dig[Feature #11643] -
Hash#to_proc[Feature #11653]
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new mode flag File::SHARE_DELETE is available. this flag means to permit deleting opened file on Windows, but currently this affect only files opened as binary. [Feature #11218]
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new option parameter ‘flags’ is added. this parameter is bitwise-ORed to oflags generated by normal mode argument. [Feature #11253]
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IO#adviseno longer raises Errno::ENOSYS in cases where it was detected at build time but not available at runtime. [Feature #11806]
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Kernel#loop, when stopped by aStopIterationexception, returns what the enumerator has returned instead of nil. [Feature #11498]
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Module#deprecate_constant[Feature #11398]
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NameError#receiveris added to take the receiver object. [Feature #10881]
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Numeric#positive?andNumeric#negative?are added, which return true when the receiver is positive and negative respectively. [Feature #11151]
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Proc#call(and also [], ===, yield) are optimized. Backtrace doesn’t show each method (show block lines directly).TracePointalso ignores these calls. [Feature #11569]
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Queue (
Thread::Queue)-
Queue#close is added to notice a termination. [Feature #10600]
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Regexp/String: Updated Unicode version from 7.0.0 to 8.0.0
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add the following methods as a primitive tool of iseq loader. See sample/iseq_loader.rb for usage. Note that loader does not have verifier so it is easy to cause critical problem by loading modified/broken binary data. See [Feature #11788] for more details. (experimental feature)
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String#+@andString#-@are added to get mutable/frozen strings. [Feature #11782] -
String.newnow accepts new option parameter ‘encoding’. [Feature #11785]
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Struct#dig[Feature #11688]
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Thread#name,Thread#name=are added to handle thread names [Feature #11251]
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Core classes compatibility issues (excluding feature bug fixes)¶ ↑
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Array#select!,Array#keep_if,Array#reject!, andArray#delete_ifno longer changes the receiver array instantly every time the block is called. [Feature #10714] -
Array#flattenandArray#flatten!no longer try to call to_ary method on elements beyond the given level. [Bug #10748] -
Array#inspectdoesn’t raise error even if its content returns a string which is not compatible withEncoding.default_externalas inspected result. [Feature #11801]
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Enumerable#chunkandEnumerable#slice_beforeno longer takes the initial_state argument. [Feature #10958] Use a local variable instead to maintain a state.
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On Windows
File::Stat#inoalways returned 0, but now returns BY_HANDLE_FILE_INFORMATION.nFileIndexHigh/Low. [Feature #11216]
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Hash#inspectdoesn’t raise error even if its content returns a string which is not compatible withEncoding.default_externalas inspected result. [Feature #11801]
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IO#closedoesn’t raise when theIOobject is closed. [Feature #10718] -
IO#each_codepointraises an exception at incomplete character before EOF when conversion takes place. [Bug #11444]
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Module#define_methodandObject.define_singleton_methodnow require method body,Proc,Method, or a block, and raiseArgumentErrorif no block is given directly. [Bug #11283]
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pack/unpack (Array/String)
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j and J directives for pointer width integer type. [Feature #11215]
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Stdlib updates (outstanding ones only)¶ ↑
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Logger#level=now supports symbol and string levels such as :debug, :info, :warn, :error, :fatal (case insensitive) [Feature #11695] -
Logger#reopenis added to reopen a log device. [Feature #11696]
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io/wait
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IO#wait_readableno longer checks FIONREAD, it may be used for non-bytestreamIOsuch as listen sockets.
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Net::FTP
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Net::FTP#mlst is added.
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Net::FTP#mlsd is added.
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nkf
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Merge nkf 2.1.4.
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ObjectSpace(objspace)-
ObjectSpace.count_symbolsis added. -
ObjectSpace.count_imemo_objectsis added. -
ObjectSpace.internal_class_ofis added. -
ObjectSpace.internal_super_ofis added.
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OpenSSL::SSL::SSLSocket#accept_nonblockandOpenSSL::SSL::SSLSocket#connect_nonblocksupports ‘exception: false`. [Feature #10532]
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Pathname#descendandPathname#ascendsupported blockless form. [Feature #11052]
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Socket#connect_nonblock,Socket#accept_nonblock,TCPServer#accept_nonblock,UNIXServer#accept_nonblock,BasicSocket#recv_nonblock,BasicSocket#recvmsg_nonblock,BasicSocket#sendmsg_nonblockall support ‘exception: false` to return :wait_readable or :wait_writable symbols instead of raisingIO::WaitReadableorIO::WaitWritableexceptions [Feature #10532] [Feature #11229] -
BasicSocket#recvandBasicSocket#recv_nonblockallow an outputStringbuffer argument likeIO#readandIO#read_nonblockto reduceGCoverhead [Feature #11242]
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In read-only mode,
StringIO#set_encodingno longer sets the encoding of its buffer string. Setting the encoding of the string directly withoutStringIO#set_encodingmay cause unpredictable behavior now. [Bug #11827]
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timeout
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Object#timeout is now warned as deprecated when called.
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Stdlib compatibility issues (excluding feature bug fixes)¶ ↑
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ext/coverage/coverage.c
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Coverage.peek_result: new method to allow coverage to be captured without stopping the coverage tool. [Feature #10816]
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Fiddle::Function#callreleases the GVL. [Feature #11607]
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io-console
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Update to io-console 0.4.5, and change the license to BSD 2-clause “Simplified” License.
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lib/base64.rb
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Base64.urlsafe_encode64: added a “padding” option to suppress the padding character (“=”). [Feature #10740] -
Base64.urlsafe_decode64: now it accepts not only correctly-padded input but also unpadded input. [Feature #10740]
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lib/drb/drb.rb
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removed unused argument. github.com/ruby/ruby/pull/515
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lib/matrix.rb
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Add Vector#round. github.com/ruby/ruby/pull/802
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lib/webrick/utils.rb
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removed unused argument. github.com/ruby/ruby/pull/356
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Net::FTP
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Connections are in passive mode per default now. The default mode can be changed by Net::FTP.default_passive=. [Feature #11612]
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default value of
Net::HTTP#open_timeoutis now 60 (was nil).
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Net::Telnet
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Net::Telnet is extracted to net-telnet gem. It’s unmaintain code. [Feature #11083]
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Updated to
Psych2.0.17
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Rake
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Rake is removed from stdlib. [Feature #11025]
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Updated to
RDoc4.2.1. For full release notes see:github.com/rdoc/rdoc/blob/master/History.rdoc#421–2015-12-22
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RubyGems
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Updated to RubyGems 2.5.1. For full release notes see:
docs.seattlerb.org/rubygems/History_txt.html#label-2.5.0+-2F+2015-11-03 and docs.seattlerb.org/rubygems/History_txt.html#label-2.5.1+-2F+2015-12-10
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Built-in global variables compatibility issues¶ ↑
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$SAFE
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$SAFE=2 and $SAFE=3 are obsolete. If $SAFE is set to 2 or larger, an
ArgumentErroris raised. [Feature #5455]
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C API updates¶ ↑
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rb_define_class_id_under() now raises a
TypeErrorexception when the class is already defined but its superclass does not match the given superclass, as well as definitions in ruby level. -
rb_timespec_now() is added to fetch current datetime as struct timespec. [Feature #11558]
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rb_time_timespec_new() is added to create a time object with epoch, nanosecond, and UTC/localtime/time offset arguments. [Feature #11558]
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rb_autoload() deprecated, use rb_funcall() instead. [Feature #11664]
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rb_compile_error_with_enc(), rb_compile_error(), and rb_compile_bug() deprecated. these functions are exposed but only for internal use. external libraries should not use them.
Supported platform changes¶ ↑
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OS/2 is no longer supported
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BeOS is no longer supported
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Borland-C is no longer supported
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Haiku now stable and best effort
Implementation improvements¶ ↑
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Optimize
Proc#callto eliminate method frame construction. [Feature #11569] -
Reconsidering method entry data structure. [Bug #11278]
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Introducing new table data structure for ID keys tables used by method table and so on. New table structure is simple and fast than st_table. [Feature #11420]
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Machine code level tuning for object allocation and method calling code. r52099, r52254
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RubyVM::InstructionSequenceis extended for future improvement. [Feature #11788] -
Case dispatch is now optimized for all special constant literals including nil, true, and false. Previously, only literal strings, symbols, integers and floats compiled to optimized case dispatch. [Feature #11769]
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Instance variables on non-pure Ruby classes (T_DATA, T_FILE, etc..) is less expensive to store than before. [Feature #11170]
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All accesses to members of big
Structobjects are performed in constant-time. Previously,Structelements beyond the first 10 elements used a linear scan. [Feature #10585] -
The
Setclass got several speed up. [Misc #10754], [r52591] -
Socketand I/O-related improvements-
Calling overhead of most of new keyword-using I/O methods in
- Feature #11229
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is reduced by avoiding the inefficient C API
to parse keywords. [Feature #11339]
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The standard library is updated to use the improved exception-free non-blocking I/O from [Feature #11229]. This has the additional benefit of quieter $DEBUG output in addition to reducing expensive exceptions. [Feature #11044]
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(Linux-only) waiting on a single FD anywhere in the stdlib no longer uses select(2), making it immune to slowdowns with high-numbered FDs. [Feature #11081] [Feature #11377]
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CGI.escapeHTMLis optimized with C extension. github.com/ruby/ruby/pull/1164