2015-12-24 12:25:26 -05:00
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# -*- 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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2016-04-13 01:36:26 -04:00
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* Multiple assignment in conditional expression is now allowed.
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[Feature #10617]
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2015-12-24 12:25:26 -05:00
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=== Core classes updates (outstanding ones only)
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2016-03-17 08:49:19 -04:00
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* Array
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2016-04-14 21:17:51 -04:00
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2016-03-17 08:49:19 -04:00
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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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2016-04-13 10:55:18 -04:00
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* Array#sum [Feature #12217]
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2016-02-16 03:34:47 -05:00
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* Dir
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2016-02-16 07:25:54 -05:00
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* Dir.empty?. [Feature #10121]
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2016-02-16 03:34:47 -05:00
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2016-04-13 02:14:12 -04:00
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* File
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* File.empty?. [Feature #9969]
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2016-04-14 21:17:51 -04:00
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* Float
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2016-04-17 23:56:33 -04:00
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* Float#ceil, Float#floor, and Float#truncate now take an optional
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digits, as well as Float#round. [Feature #12245]
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2016-04-14 21:17:51 -04:00
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* Integer
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2016-04-17 23:55:33 -04:00
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* Integer#ceil, Integer#floor, and Integer#truncate now take an optional
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digits, as well as Integer#round. [Feature #12245]
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2016-04-14 21:17:51 -04:00
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2016-02-16 22:21:35 -05:00
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* String
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* String.new(capacity: size) [Feature #12024]
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2016-02-20 23:52:04 -05:00
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* Symbol
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* Symbol#match now returns MatchData. [Bug #11991]
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2016-02-18 00:29:18 -05:00
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* MatchData
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* MatchData#named_captures [Feature #11999]
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2015-12-24 12:25:26 -05:00
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=== Stdlib updates (outstanding ones only)
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2016-01-01 08:02:56 -05:00
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* CSV
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2016-04-14 21:17:51 -04:00
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2016-01-01 08:02:56 -05:00
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* Add a liberal_parsing option. [Feature #11839]
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2016-04-18 23:55:13 -04:00
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* Logger
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* Allow specifying logger parameters in constructor such
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as level, progname, datetime_format, formatter. [Feature #12224]
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* Add shift_period_suffix option. [Feature #10772]
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2016-01-06 03:23:10 -05:00
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* optparse
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2016-04-14 21:17:51 -04:00
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2016-01-06 03:23:10 -05:00
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* Add an into option. [Feature #11191]
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2016-04-15 11:26:48 -04:00
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=== Compatibility issues (excluding feature bug fixes)
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* Array#sum is implemented. Ruby itself has no compatibility problem
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because Ruby didn't have sum method for arrays before Ruby 2.4.
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However many third party gems, activesupport, facets, simple_stats, etc,
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defines sum method. These implementations are mostly compatible but
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there are subtle differences.
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Ruby's sum method should be mostly compatible but it is impossible to
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be perfectly compatible with all of them.
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2015-12-24 12:25:26 -05:00
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2016-04-23 00:23:29 -04:00
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=== Stdlib compatibility issues (excluding feature bug fixes)
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2016-04-23 00:27:12 -04:00
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* Time
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* Time#to_time now preserves timezone. [Bug #12271]
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2016-04-23 00:23:29 -04:00
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* DateTime
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* DateTime#to_time now preserves timezone. [Bug #12189]
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2015-12-24 12:25:26 -05:00
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=== C API updates
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2016-01-06 21:34:33 -05:00
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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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2015-12-24 12:25:26 -05:00
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=== Supported platform changes
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=== Implementation improvements
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2016-03-17 08:49:19 -04:00
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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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