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145 lines
4.2 KiB
Text
145 lines
4.2 KiB
Text
# -*- rdoc -*-
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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
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reference information is supplied with. For a full list of changes
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with all sufficient information, see the ChangeLog file or Redmine
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(e.g. <tt>https://bugs.ruby-lang.org/issues/$FEATURE_OR_BUG_NUMBER</tt>)
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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. [Feature #14250]
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* refinements take place at block passing. [Feature #14223]
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=== Core classes updates (outstanding ones only)
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* Array
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* Aliased methods:
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* Array#filter is a new alias for Array#select [Feature #13784]
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* Array#filter! is a new alias for Array#select! [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. [Feature #13969]
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* Enumerable
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* Aliased methods:
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* Enumerable#filter is a new alias for Enumerable#select [Feature #13784]
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* Enumerator::Lazy
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* Aliased methods:
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* Enumerator::Lazy#filter is a new alias for Enumerator::Lazy#select [Feature #13784]
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* Hash
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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! [Feature #13784]
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* Kernel
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* Kernel.#system takes :exception option to raise an exception on
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failure. [Feature #14386]
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* KeyError
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* KeyError#initialize accepts :receiver and :key options to set receiver and key in Ruby code. [Feature #14313]
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* NameError
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* NameError#initialize accepts :receiver option to set receiver in Ruby code. [Feature #14313]
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* NoMethodError
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* NoMethodError#initialize accepts :receiver option to set receiver in Ruby code. [Feature #14313]
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* Proc
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* Proc#call doesn't change $SAFE any more. [Feature #14250]
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* Random
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* New methods:
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* added Random.bytes. [Feature #4938]
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=== Stdlib updates (outstanding ones only)
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* ERB
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* Add :trim_mode and :eoutvar keyword arguments to ERB.new. Now non-keyword arguments other than first one
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are softly deprecated and will be removed when Ruby 2.5 becomes EOL. [Feature #14256]
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* erb command's -S option is deprecated, which will be removed in the next version.
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* Matrix
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* New method:
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* Matrix#antisymmetric?
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* Set
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* Aliased methods:
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* Set#filter! is a new alias for Set#select! [Feature #13784]
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=== Compatibility issues (excluding feature bug fixes)
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=== Stdlib compatibility issues (excluding feature bug fixes)
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=== C API updates
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=== Supported platform changes
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=== Implementation improvements
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* Speedup `Proc#call` because we don't need to care about `$SAFE` any more. [Feature #14318]
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With `lc_fizzbuzz` benchmark which uses so many `Proc#call` we can measure
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x1.4 improvements [Bug #10212].
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* Speedup `block.call` where `block` is passed block parameter. [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. [Feature #14235] [experimental]
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* `--jit` option is added to enable JIT. `--jit-verbose=1` is good for inspection. See `ruby --help` for others.
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* This JIT relies on C compiler used to build Ruby, on runtime. Only gcc and clang are supported for the JIT
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for now, and MinGW support has some issues.
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* As of 2.6.0-preview1, we're just preparing infrastructure for JIT and very few optimizations are implemented.
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So it's not ready for benchmarking Ruby's JIT performance yet. It's known that current JIT enablement makes
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Rails application slower for now.
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* VM generator script renewal; makes the generated VM more optimized. [GH-1779]
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=== Miscellaneous changes
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