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69 lines
1.9 KiB
Text
69 lines
1.9 KiB
Text
# -*- rdoc -*-
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= NEWS for Ruby 2.4.0
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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 2.3.0 release
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=== Language changes
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=== Core classes updates (outstanding ones only)
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* Array
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* Array#max and Array#min. [Feature #12172]
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This may cause a tiny incompatibility: if you redefine
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Enumerable#max and call max to an Array, your redefinition will be
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now ignored. You should also redefine Array#max.
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* Dir
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* Dir.empty?. [Feature #10121]
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* String
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* String.new(capacity: size) [Feature #12024]
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* Symbol
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* Symbol#match now returns MatchData. [Bug #11991]
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* MatchData
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* MatchData#named_captures [Feature #11999]
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=== Stdlib updates (outstanding ones only)
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* CSV
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* Add a liberal_parsing option. [Feature #11839]
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* optparse
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* Add an into option. [Feature #11191]
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=== Stdlib compatibility issues (excluding feature bug fixes)
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=== Built-in global variables compatibility issues
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=== C API updates
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* ruby_show_version() will no longer exits the process, if
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RUBY_SHOW_COPYRIGHT_TO_DIE is set to 0. This will be the default in
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the future.
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=== Supported platform changes
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=== Implementation improvements
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* In some condition, `[x, y].max` and `[x, y].min` are optimized
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so that a temporal array is not created. The concrete condition is
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an implementation detail: currently, the array literal must have no
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splat, must have at least one expression but literal, the length must
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be <= 0x100, and Array#max and min must not be redefined. It will work
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in most casual and real-life use case where it is written with intent
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to `Math.max(x, y)`.
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