NEWS for Ruby 3.3.0¶ ↑
This document is a list of user-visible feature changes since the 3.2.0 release, except for bug fixes.
Note that each entry is kept to a minimum, see links for details.
Language changes¶ ↑
Command line options¶ ↑
-
A new
performance
warning category was introduced. They are not displayed by default even in verbose mode. Turn them on with-W:performance
orWarning[:performance] = true
. [Feature #19538]
Core classes updates¶ ↑
Note: We’re only listing outstanding class updates.
-
-
Array#pack
now raisesArgumentError
for unknown directives. [Bug #19150]
-
-
-
Dir.for_fd
added for returning aDir
object for the directory specified by the provided directory file descriptor. [Feature #19347] -
Dir.fchdir
added for changing the directory to the directory specified by the provided directory file descriptor. [Feature #19347] -
Dir#chdir
added for changing the directory to the directory specified by the providedDir
object. [Feature #19347]
-
-
-
MatchData#named_captures
now accepts optionalsymbolize_names
keyword. [Feature #19591]
-
-
-
String#unpack
now raisesArgumentError
for unknown directives. [Bug #19150] -
String#bytesplice
now accepts new arguments index/length or range of the source string to be copied. [Feature #19314]
-
-
-
New core class to build collections with weak references. The class use equality semantic to lookup keys like a regular hash, but it doesn't hold strong references on the keys. [Feature #18498]
-
Stdlib updates¶ ↑
The following default gems are updated.
-
RubyGems 3.5.0.dev
-
bigdecimal 3.1.4
-
bundler 2.5.0.dev
-
csv 3.2.7
-
fiddle 1.1.2
-
fileutils 1.7.1
-
irb 1.7.0
-
nkf 0.1.3
-
optparse 0.4.0.pre.1
-
psych 5.1.0
-
reline 0.3.5
-
stringio 3.0.8
-
strscan 3.0.7
-
syntax_suggest 1.1.0
-
time 0.2.2
-
timeout 0.3.2
-
uri 0.12.1
The following bundled gems are updated.
-
minitest 5.18.0
-
test-unit 3.5.9
-
rbs 3.1.0
-
typeprof 0.21.7
-
debug 1.8.0
See GitHub releases like Logger or changelog for details of the default gems or bundled gems.
Supported platforms¶ ↑
Compatibility issues¶ ↑
Stdlib compatibility issues¶ ↑
ext/readline
is retired¶ ↑
-
We have
reline
that is pure Ruby implementation compatible withext/readline
API. We rely onreline
in the future. If you need to useext/readline
, you can installext/readline
via rubygems.org withgem install readline-ext
. -
We no longer need to install libraries like
libreadline
orlibedit
.
C API updates¶ ↑
Implementation improvements¶ ↑
-
defined?(@ivar)
is optimized withObject
Shapes.
YJIT¶ ↑
-
Significant performance improvements over 3.2
-
Splat and rest arguments support has been improved.
-
Registers are allocated for stack operations of the virtual machine.
-
More calls with optional arguments are compiled.
-
Integer#!=
,String#!=
,Kernel#block_given?
,Kernel#is_a?
,Kernel#instance_of?
,Module#===
are specially optimized. -
Instance variables no longer exit to the interpreter with megamorphic
Object
Shapes. -
Metadata for compiled code uses a lot less memory.
-
Improved code generation on ARM64
-
Option to start YJIT in paused mode and then later enable it manually
-
--yjit-pause
andRubyVM::YJIT.resume
-
This can be used to enable YJIT only once your application is done booting
-
Exit tracing option now supports sampling
-
--trace-exits-sample-rate=N
-
Multiple bug fixes
RJIT¶ ↑
-
Introduced a pure-Ruby JIT compiler RJIT and replaced MJIT.
-
RJIT supports only x86_64 architecture on Unix platforms.
-
Unlike MJIT, it doesn’t require a C compiler at runtime.
-
RJIT exists only for experimental purposes.
-
You should keep using YJIT in production.