Posted by naruse on 25 Dec 2017
We are pleased to announce the release of Ruby 2.5.0.
Ruby 2.5.0 is the first stable release of the Ruby 2.5 series. It introduces many new features and performance improvements. The notable changes are as follows:
ensureare now allowed to be used directly with
endblocks. [Feature #12906]
yield_selfto yield given block in its context. Unlike
tap, it returns the result of the block. [Feature #6721]
- Support branch coverage and method coverage measurement. The branch coverage indicates which branches are executed and which are not. The method coverage indicates which methods are invoked and which are not. By running a test suite with these new features, you will know which branches and methods are executed, and evaluate total coverage of the test suite more strictly. [Feature #13901]
- Hash#slice [Feature #8499] and Hash#transform_keys [Feature #13583]
- Struct.new can create classes that accept keyword arguments. [Feature #11925]
- Enumerable#any?, all?, none?, and one? accept a pattern argument. [Feature #11286]
- Top-level constant look-up is no longer available. [Feature #11547]
- One of our most loved libraries, pp.rb, is now automatically loaded.
You no longer have to write
require "pp". [Feature #14123]
- Print backtrace and error message in reverse order (oldest call first, most recent call last). When a long backtrace appears on your terminal (TTY), you can easily find the cause line at the bottom of the backtrace. Note that the order is reversed only when the backtrace is printed out to the terminal directly. [Feature #8661] [experimental]
- About 5-10% performance improvement by removing all
traceinstructions from overall bytecode (instruction sequences). The
traceinstruction was added to support the
TracePoint. However, in most cases,
TracePointis not used and
traceinstructions are pure overhead. Instead, now we use a dynamic instrumentation technique. See [Feature #14104] for more details.
- Block passing by a block parameter (e.g.
def foo(&b); bar(&b); end) is about 3 times faster than Ruby 2.4 by “Lazy Proc allocation” technique. [Feature #14045]
- Mutex is rewritten to be smaller and faster. [Feature #13517]
- ERB now generates code from a template twice as fast as Ruby 2.4.
- Improve performance of some built-in methods including
Time#+, and more.
- IO.copy_stream uses copy_file_range(2) to copy offload. [Feature #13867]
Other notable changes since 2.4
- SecureRandom now prefers OS-provided sources over OpenSSL. [Bug #9569]
- Promote cmath, csv, date, dbm, etc, fcntl, fiddle, fileutils, gdbm, ipaddr, scanf, sdbm, stringio, strscan, webrick, zlib from standard libraries to default gems.
- Update to Onigmo 6.1.3.
- Update to Psych 3.0.2.
- Update to RubyGems 2.7.3.
- Update to RDoc 6.0.1.
- Switch the lexer from IRB based one to Ripper. This dramatically improves the performance of document generation.
- Fix a significant amount of bugs that existed over ten years.
- Add support for new Ruby syntax from the latest versions.
- Update supported Unicode version to 10.0.0.
Thread.report_on_exceptionis now set to true by default. This change helps debugging of multi-threaded programs. [Feature #14143]
- IO#write now receives multiple arguments. [Feature #9323]
With those changes, 6158 files changed, 348484 insertions(+), 82747 deletions(-) since Ruby 2.4.0!
Merry Christmas, Happy Holidays, and enjoy programming with Ruby 2.5!
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