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166 lines
4.2 KiB
Markdown
166 lines
4.2 KiB
Markdown
# NEWS for Ruby 3.1.0
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This document is a list of user visible feature changes
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since the **3.0.0** release, except for bug fixes.
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Note that each entry is kept to a minimum, see links for details.
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## Language changes
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* Pin operator now takes an expression. [[Feature #17411]]
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```ruby
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Prime.each_cons(2).lazy.find_all{_1 in [n, ^(n + 2)]}.take(3).to_a
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#=> [[3, 5], [5, 7], [11, 13]]
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```
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* Multiple assignment evaluation order has been made consistent with
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single assignment evaluation order. With single assignment, Ruby
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uses a left-to-right evaluation order. With this code:
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```ruby
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foo[0] = bar
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```
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The following evaluation order is used:
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1. `foo`
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2. `bar`
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3. `[]=` called on the result of `foo`
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In Ruby before 3.1.0, multiple assignment did not follow this
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evaluation order. With this code:
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```ruby
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foo[0], bar.baz = a, b
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```
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Versions of Ruby before 3.1.0 would evaluate in the following
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order
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1. `a`
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2. `b`
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3. `foo`
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4. `[]=` called on the result of `foo`
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5. `bar`
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6. `baz=` called on the result of `bar`
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Starting in Ruby 3.1.0, evaluation order is now consistent with
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single assignment, with the left hand side being evaluated before
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the right hand side:
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1. `foo`
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2. `bar`
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3. `a`
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4. `b`
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5. `[]=` called on the result of `foo`
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6. `baz=` called on the result of `bar`
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[[Bug #4443]]
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## Command line options
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## Core classes updates
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Outstanding ones only.
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* Array
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* Array#intersect? is added. [[Feature #15198]]
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* Enumerable
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* Enumerable#compact is added. [[Feature #17312]]
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* Enumerable#tally now accepts an optional hash to count. [[Feature #17744]]
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* Enumerator::Lazy
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* Enumerator::Lazy#compact is added. [[Feature #17312]]
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* File
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* File.dirname now accepts an optional argument for the level to
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strip path components. [[Feature #12194]]
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* Module
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* Module#prepend now modifies the ancestor chain if the receiver
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already includes the argument. Module#prepend still does not
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modify the ancestor chain if the receiver has already prepended
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the argument. [[Bug #17423]]
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* Struct
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* Passing only keyword arguments to Struct#initialize is warned.
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You need to use a Hash literal to set a Hash to a first member.
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[[Feature #16806]]
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* Queue
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* Queue#initialize now accepts an Enumerable of initial values.
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[[Feature #17327]]
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* Thread
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* Thread#native_thread_id is added. [[Feature #17853]]
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* Thread::Backtrace
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* Thread::Backtrace.limit, which returns the value to limit backtrace
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length set by `--backtracse-limit` command line option, is added.
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[[Feature #17479]]
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* $LOAD_PATH
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* $LOAD_PATH.resolve_feature_path does not raise. [[Feature #16043]]
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## Stdlib updates
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Outstanding ones only.
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## Compatibility issues
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Excluding feature bug fixes.
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## Stdlib compatibility issues
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* `ERB#initialize` warns `safe_level` and later arguments even without -w.
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[[Feature #14256]]
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## C API updates
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## Implementation improvements
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### JIT
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* `RubyVM::MJIT` is renamed to `RubyVM::JIT`.
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## Static analysis
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### RBS
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### TypeProf
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## Miscellaneous changes
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* lib/objspace/trace.rb is added, which is a tool for tracing the object
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allocation. Just by requiring this file, tracing is started *immediately*.
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Just by `Kernel#p`, you can investigate where an object was created.
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Note that just requiring this file brings a large performance overhead.
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This is only for debugging purpose. Do not use this in production.
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[Feature #17762]
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[Bug #4443]: https://bugs.ruby-lang.org/issues/4443
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[Feature #12194]: https://bugs.ruby-lang.org/issues/12194
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[Feature #14256]: https://bugs.ruby-lang.org/issues/14256
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[Feature #15198]: https://bugs.ruby-lang.org/issues/15198
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[Feature #16043]: https://bugs.ruby-lang.org/issues/16043
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[Feature #16806]: https://bugs.ruby-lang.org/issues/16806
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[Feature #17312]: https://bugs.ruby-lang.org/issues/17312
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[Feature #17327]: https://bugs.ruby-lang.org/issues/17327
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[Feature #17411]: https://bugs.ruby-lang.org/issues/17411
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[Bug #17423]: https://bugs.ruby-lang.org/issues/17423
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[Feature #17479]: https://bugs.ruby-lang.org/issues/17479
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[Feature #17744]: https://bugs.ruby-lang.org/issues/17744
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[Feature #17762]: https://bugs.ruby-lang.org/issues/17762
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