Posted by naruse on 25 Dec 2016
We are pleased to announce the release of Ruby 2.4.0.
Ruby 2.4.0 is the first stable release of the Ruby 2.4 series. It introduces many new features, for example:
Introduce hash table improvement (by Vladimir Makarov)
Improve the internal structure of hash table (st_table) by introducing open addressing and an inclusion order array. This improvement has been discussed with many people, especially with Yura Sokolov.
Binding#irb: Start a REPL session similar to
While you are debugging, you may often use
p to see the value of variables.
With pry you can use
binding.pry in your application
to launch a REPL and run any Ruby code.
binding.irb which behaves like that with irb.
Unify Fixnum and Bignum into Integer
Though ISO/IEC 30170:2012 doesn’t specify details of the Integer class, Ruby had two visible Integer classes: Fixnum and Bignum. Ruby 2.4 unifies them into Integer. All C extensions which touch the Fixnum or Bignum class need to be fixed.
See also the ticket and akr’s slides.
String supports Unicode case mappings
String/Symbol#upcase/downcase/swapcase/capitalize(!) now handle
Unicode case mappings instead of only ASCII case mappings.
Ruby 2.4 also contains the following performance improvements including language changes:
[x, y].max and
[x, y].min are optimized to not create a temporary array
under certain conditions.
Regexp#match?, which executes a regexp match without creating
a back reference object and changing
$~ to reduce object allocation.
Other performance improvements
Thread#report_on_exception and Thread.report_on_exception
Ruby ignores exceptions in threads unless another thread explicitly joins them.
report_on_exception = true,
you can notice if a thread has died due to an unhandled exception.
Send us feedback what should be the default for
and about report-on-GC, which shows a report when a thread is
garbage collected without join.
Thread deadlock detection now shows threads with their backtrace and dependency
Ruby has deadlock detection around waiting threads, but its report doesn’t include enough information for debugging. Ruby 2.4’s deadlock detection shows threads with their backtrace and dependent threads.
Other notable changes since 2.3
- Support OpenSSL 1.1.0 (drop support for 0.9.7 or prior)
- ext/tk is now removed from stdlib Feature #8539
- XMLRPC is now removed from stdlib Feature #12160
See NEWS or commit logs for details.
With those changes, 2523 files changed, 289129 insertions(+), 84670 deletions(-) since Ruby 2.3.0!
Merry Christmas, Happy Holidays, and enjoy programming with Ruby 2.4!
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