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451 строка
12 KiB
Plaintext
# -*- markdown -*- markup: Markdown
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# NEWS for Ruby 2.6.0
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This document is a list of user visible feature changes made between
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releases except for bug fixes.
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Note that each entry is kept so brief that no reason behind or reference
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information is supplied with. For a full list of changes with all
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sufficient information, see the ChangeLog file or Redmine
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(e.g. `https://bugs.ruby-lang.org/issues/$FEATURE_OR_BUG_NUMBER`)
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## Changes since the 2.5.0 release
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### Language changes
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* `$SAFE` is a process global state and we can set 0 again.
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[Feature #14250]
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* refinements take place at block passing. [Feature #14223]
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* `else` without `rescue` now causes a syntax error. [EXPERIMENTAL]
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* constant names may start with a non-ASCII capital letter.
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[Feature #13770]
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* An endless range is introduced. You can write a range that has no end,
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like `(0..)`. The following shows typical use cases. [Feature #12912]
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```ruby
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ary[1..] # identical to ary[1..-1]
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(1..).each {|index| ... } # infinite loop from index 1
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ary.zip(1..) {|elem, index| ... } # ary.each.with_index(1) { }
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```
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* Non-`Symbol` key in keyword arguments hash causes an exception.
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### Core classes updates (outstanding ones only)
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* `Array`
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* New methods:
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* Added `Array#union` and `Array#difference` instance method.
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[Feature #14097]
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* Modified methods:
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* `Array#to_h` now maps elements to new keys and values by the
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block if given. [Feature #15143]
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* Aliased methods:
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* `Array#filter` is a new alias for `Array#select`.
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[Feature #13784]
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* `Array#filter!` is a new alias for `Array#select!`.
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[Feature #13784]
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* `Binding`
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* New methods:
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* added `Binding#source_location`. [Feature #14230]
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This method returns the source location of binding, a 2-element
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array of `__FILE__` and `__LINE__`. Traditionally, the same
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information could be retrieved by `eval("[__FILE__, __LINE__]",
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binding)`, but we are planning to change this behavior so that
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`Kernel#eval` ignores binding's source location [Bug #4352].
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So, users should use this newly-introduced method instead of
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`Kernel#eval`.
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* `Dir`
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* New methods:
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* added `Dir#each_child` and `Dir#children` instance methods.
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[Feature #13969]
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* `Enumerable`
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* Modified methods:
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* `Enumerable#to_h` now maps elements to new keys and values
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by the block if given. [Feature #15143]
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* Aliased methods:
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* `Enumerable#filter` is a new alias for `Enumerable#select`.
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[Feature #13784]
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* `Enumerator::ArithmeticSequence`
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* This is a new class to represent a generator of an arithmetic sequence,
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that is a number sequence defined by a common difference. It can be used
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for representing what is similar to Python's slice. You can get an
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instance of this class from `Numeric#step` and `Range#step`.
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* `Enumerator::Lazy`
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* Aliased methods:
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* `Enumerator::Lazy#filter` is a new alias for
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`Enumerator::Lazy#select`. [Feature #13784]
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* `ENV`
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* Modified methods:
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* `ENV.to_h` now maps names and values to new keys and values
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by the block if given. [Feature #15143]
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* `Exception`
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* New options:
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* `Exception#full_message` takes `:highlight` and `:order` options.
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[Bug #14324]
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* `Hash`
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* Modified methods:
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* `Hash#merge`, `update`, `merge!` and `update!` now accept multiple
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arguments. [Feature #15111]
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* `Hash#to_h` now maps keys and values to new keys and values
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by the block if given. [Feature #15143]
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* Aliased methods:
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* `Hash#filter` is a new alias for `Hash#select`. [Feature #13784]
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* `Hash#filter!` is a new alias for `Hash#select!`.
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[Feature #13784]
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* `IO`
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* New options:
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* new mode character `'x'` to open files for exclusive access.
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[Feature #11258]
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* `Kernel`
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* Aliased methods:
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* `Kernel#then` is a new alias for `Kernel#yield_self`.
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[Feature #14594]
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* New options:
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* `Kernel.#Complex`, `Kernel.#Float`, `Kernel.#Integer` and
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`Kernel.#Rational` take `:exception` option to specify the way of
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error handling. [Feature #12732]
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* `Kernel.#system` takes `:exception` option to raise an exception
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on failure. [Feature #14386]
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* Incompatible changes:
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* `system()` and `exec()` do not close non-standard file descriptors
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(The default of `:close_others` option is changed to `false` by
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default. but we still set the `FD_CLOEXEC` flag on descriptors we
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create). [Misc #14907]
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* `KeyError`
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* New options:
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* `KeyError#initialize` accepts `:receiver` and `:key` options to
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set receiver and key in Ruby code. [Feature #14313]
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* `Module`
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* New methods:
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* `Module#method_defined?`, `Module#private_method_defined?` and
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`Module#protected_method_defined?` now accepts the second
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parameter as optional. If it's `true` (=default), checks ancestor
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modules/classes, or checks only the class itself.
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[Feature #14944]
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* `NameError`
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* New options:
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* `NameError#initialize` accepts `:receiver` option to set receiver
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in Ruby code. [Feature #14313]
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* `NoMethodError`
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* New options:
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* `NoMethodError#initialize` accepts `:receiver` option to set
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receiver in Ruby code. [Feature #14313]
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* `Numeric`
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* Incompatible changes:
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* `Numeric#step` now returns an instance of
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`Enumerator::ArithmeticSequence` class rather than one of
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`Enumerator` class.
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* `Proc`
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* Incompatible changes:
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* `Proc#call` doesn't change `$SAFE` any more. [Feature #14250]
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* `Random`
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* New methods:
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* added `Random.bytes`. [Feature #4938]
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* `Range`
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* New methods:
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* Added `Range#%` instance method. [Feature #14697]
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* Incompatible changes:
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* `Range#===` now uses `#cover?` instead of `#include?` method.
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[Feature #14575]
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* `Range#cover?` now accepts Range object. [Feature #14473]
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* `Range#step` now returns an instance of
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`Enumerator::ArithmeticSequence` class rather than one of
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`Enumerator` class.
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* `RubyVM::AST`
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* New methods:
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* `RubyVM::AST.parse` parses a given string and returns AST nodes.
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[experimental]
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* `RubyVM::AST.parse_file` parses a given file and returns AST
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nodes. [experimental]
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* `String`
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* New features:
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* `String#split` yields each substring to the block if given.
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[Feature #4780]
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* `Struct`
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* Modified methods:
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* `Struct#to_h` now maps keys and values to new keys and values
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by the block if given. [Feature #15143]
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* Aliased method:
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* `Struct#filter` is a new alias for `Struct#select` [Feature #13784]
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* `Time`
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* New features:
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* `Time.new` and `Time#getlocal` accept a timezone object as
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well as UTC offset string. `Time#+`, `Time#-` and `Time#succ`
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also preserve the timezone. [Feature #14850]
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* `TracePoint`
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* New methods:
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* `TracePoint#parameters` [Feature #14694]
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### Stdlib updates (outstanding ones only)
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* `ERB`
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* New options:
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* Add `:trim_mode` and `:eoutvar` keyword arguments to `ERB.new`.
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Now non-keyword arguments other than first one are softly
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deprecated and will be removed when Ruby 2.5 becomes EOL.
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[Feature #14256]
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* erb command's `-S` option is deprecated, which will be removed in
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the next version.
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* `FileUtils`
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* New method:
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* `FileUtils#cp_lr`. [Feature #4189]
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* `Matrix`
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* New methods:
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* `Matrix#antisymmetric?`
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* `Matrix#reflexive?`
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* `Net`
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* New options:
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* Add `:write_timeout` keyword argument to `Net::BufferedIO.new`.
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[Feature #13396]
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* New methods:
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* Add `Net::BufferedIO#write_timeout`,
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`Net::BufferedIO#write_timeout=`, `Net::HTTP#write_timeout`, and
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`Net::HTTP#write_timeout=`. [Feature #13396]
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* New constant:
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* Add `Net::HTTPClientException` to deprecate
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`Net::HTTPServerException`, whose name is misleading. [Bug #14688]
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* `REXML`
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* Improved some XPath implementations:
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* `concat()` function: Stringify all arguments before concatenating
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* `string()` function: Support context node
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* `string()` function: Support processing instruction node
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* Support `"*:#{ELEMENT_NAME}"` syntax in XPath 2.0
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* Fixed some XPath implementations:
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* `"//#{ELEMENT_NAME}[#{POSITION}]"` case
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* `string()` function: Fix `function(document)` returns nodes that
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are out of root elements.
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* `"/ #{ELEMENT_NAME} "` case
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* `"/ #{ELEMENT_NAME} [ #{PREDICATE} ]"` case
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* `"/ #{AXIS}:: #{ELEMENT_NAME} "` case
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* `"#{N}-#{M}"` case: One or more white spaces were required before
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`"-"`
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* `"/child::node()"` case
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* `"#{FUNCTION}()/#{PATH}"` case
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* `"@#{ATTRIBUTE}/parent::"` case
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* `"name(#{NODE_SET})"` case
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* `RSS`
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* New options:
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* `RSS::Parser.parse`: Accept options as `Hash`. `:validate`,
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`:ignore_unknown_element`, `:parser_class` options are available.
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* `Set`
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* Aliased methods:
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* `Set#filter!` is a new alias for `Set#select!`. [Feature #13784]
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* `URI`
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* New constant:
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* Add `URI::File` to handle file URI scheme. [Feature #14035]
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### Compatibility issues (excluding feature bug fixes)
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* `File`
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* `File.read`, `File.binread`, `File.write`, `File.binwrite`,
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`File.foreach`, and `File.readlines` do not invoke external commands
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even if the path starts with the pipe character `'|'`.
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[Feature #14245]
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* `Dir`
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* `Dir.glob` with `'\0'`-separated pattern list will be deprecated, and
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is now warned. [Feature #14643]
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### Stdlib compatibility issues (excluding feature bug fixes)
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### C API updates
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### Supported platform changes
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### Implementation improvements
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* Speedup `Proc#call` because we don't need to care about `$SAFE` any more.
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[Feature #14318]
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With `lc_fizzbuzz` benchmark which uses so many `Proc#call` we can
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measure x1.4 improvements. [Bug #10212]
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* Speedup `block.call` where `block` is passed block parameter.
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[Feature #14330]
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Ruby 2.5 improves block passing performance. [Feature #14045]
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Additionally, Ruby 2.6 improves the performance of passed block calling.
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* Introduce an initial implementation of JIT (Just-in-time) compiler.
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[Feature #14235] [experimental]
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* `--enable=jit` option is added to enable JIT. `--jit-verbose=1` is good for
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inspection. See `ruby --help` for others.
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* This JIT relies on C compiler used to build Ruby, on runtime. Only
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gcc and clang are supported for the JIT for now, and MinGW support has
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some issues.
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* As of 2.6.0-preview1, we're just preparing infrastructure for JIT and
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very few optimizations are implemented. So it's not ready for
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benchmarking Ruby's JIT performance yet. It's known that current JIT
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enablement makes Rails application slower for now.
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* rb_waitpid reimplemented on Unix-like platforms to maintain
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compatibility [Bug #14867]
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* VM generator script renewal; makes the generated VM more optimized.
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[GH-1779]
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* Thread cache enabled for pthreads platforms (for `Thread.new` and
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`Thread.start`). [Feature #14757]
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* timer thread is eliminated for platforms with POSIX timers [Misc #14937]
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### Miscellaneous changes
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* On macOS, shared libraries no longer include a full version number of ruby
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in their names. This eliminates the burden of each teeny upgrade on the
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platform that users need to rebuild every extension library.
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* Before:
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* libruby.2.6.0.dylib
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* libruby.2.6.dylib -> libruby.2.6.0.dylib
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* libruby.dylib -> libruby.2.6.0.dylib
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* After:
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* libruby.2.6.dylib
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* libruby.dylib -> libruby.2.6.dylib
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### Misc
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* Extracted misc/*.el files to https://github.com/ruby/elisp
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