Ruby 2.5 系列第一个稳定版本发布，新版包括了一系列新的特性和性能改进。主要变化包括：rescue/else/ensure
允许直接与 do/end 块使用，yield 增加 yield_self，Struct.new
能创建接受关键字参数的类，最高级常量查询不再可用，移除所有 trace 指令提升 5-10% 性能，SecureRandom
将更偏向使用操作系统提供的 SSL 库，等等。
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 the 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]
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 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 which runs twice as fast as Ruby 2.4.
Improve performance of some built-in methods including
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.
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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