This document is a list of user-visible feature changes since the 3.1.0 release, except for bug fixes.
Note that each entry is kept to a minimum, see links for details.
Anonymous rest and keyword rest arguments can now be passed as arguments, instead of just used in method parameters. [Feature #18351]
def foo(*) bar(*) end def baz(**) quux(**) end
A proc that accepts a single positional argument and keywords will no longer autosplat. [Bug #18633]
ruby proc{|a, **k| a}.call([1, 2]) # Ruby 3.1 and before # => 1 # Ruby 3.2 and after # => [1, 2]
Constant assignment evaluation order for constants set on explicit objects has been made consistent with single attribute assignment evaluation order. With this code:
foo::BAR = baz
foo
is now called before baz
. Similarly, for multiple assignment to constants, left-to-right evaluation order is used. With this code:
```ruby foo1::BAR1, foo2::BAR2 = baz1, baz2 ```
The following evaluation order is now used:
foo1
foo2
baz1
baz2
Find pattern is no longer experimental. [Feature #18585]
Note: We're only listing outstanding class updates.
Hash#shift
now always returns nil if the hash is empty, instead of returning the default value or calling the default proc. [Bug #16908]
Hash#shift
now always returns nil if the hash is empty, instead of returning the default value or calling the default proc. [Bug #16908]
Kernel#binding
raises RuntimeError
if called from a non-Ruby frame (such as a method defined in C). [Bug #18487]
MatchData#byteoffset
has been added. [Feature #13110]
Module.used_refinements
has been added. [Feature #14332]
Module#refinements
has been added. [Feature #12737]
Module#const_added
has been added. [Feature #17881]
Proc#dup
returns an instance of subclass. [Bug #17545]
Proc#parameters
now accepts lambda keyword. [Feature #15357]
Refinement#refined_class has been added. [Feature #12737]
Set
Set is now available as a builtin class without the need for require "set"
. [Feature #16989] It is currently autoloaded via the Set
constant or a call to Enumerable#to_set
.
String#byteindex
and String#byterindex
have been added. [Feature #13110]
Update Unicode to Version 14.0.0 and Emoji Version 14.0. [Feature #18037] (also applies to Regexp
)
String#bytesplice
has been added. [Feature #18598]
A Struct
class can also be initialized with keyword arguments without keyword_init: true
on Struct.new
[Feature #16806]
TracePoint#binding
now returns nil
for c_call
/c_return
TracePoints. [Bug #18487]
TracePoint#enable
target_thread
keyword argument now defaults to the current thread if target
and target_line
keyword arguments are not passed. [Bug #16889]
The following default gem are updated.
RubyGems 3.4.0.dev
bigdecimal 3.1.2
bundler 2.4.0.dev
cgi 0.3.2
etc 1.4.0
io-console 0.5.11
io-wait 0.2.2.pre1
ipaddr 1.2.4
logger 1.5.1
net-protocol 0.1.3
ostruct 0.5.5
reline 0.3.1
securerandom 0.2.0
The following bundled gems are updated.
net-imap 0.2.3
rbs 2.3.0
typeprof 0.21.2
debug 1.5.0
The following default gems are now bundled gems.
Note: Excluding feature bug fixes.
The following deprecated constants are removed.
Fixnum
and Bignum
[Feature #12005]
Random::DEFAULT
[Feature #17351]
Struct::Group
Struct::Passwd
The following deprecated methods are removed.
Dir.exists?
[Feature #17391]
File.exists?
[Feature #17391]
Kernel#=~
[Feature #15231]
Kernel#taint
, Kernel#untaint
, Kernel#tainted?
[Feature #16131]
Kernel#trust
, Kernel#untrust
, Kernel#untrusted?
[Feature #16131]
Psych
no longer bundles libyaml sources. Users need to install the libyaml library themselves via the package system. [Feature #18571]
The following deprecated APIs are removed.
rb_cData
variable.
“taintedness” and “trustedness” functions. [Feature #16131]