Ruby 2.4.0正式版发布

Ruby 2.4.0 正式版发布了。Ruby 是一门跨平台、面向对象的动态类型编程语言。Ruby 体现了表达的一致性和简单性，它不仅是一门编程语言，更是表达想法的一种简练方式。

此文档是除了错误修复之外的用户可见的功能更改的列表。注意：每个条目保持如此简短，以致不提供背后的原因或参考信息。有关具体所有的完整更改列表，请参阅 ChangeLog 文件或 Redmine。

部分更新内容：

Changes since the 2.3.0 release

Language changes

• Multiple assignment in conditional expression is now allowed. [Feature #10617]

• Refinements is enabled at method by Symbol#to_proc.  [Feature #9451]

• Refinements is enabled with Kernel#send and BasicObject#__send__. [Feature #11476]

• Rescue modifier now applicable to method arguments. [Feature #12686]

• Toplevel return is now allowed.  [Feature #4840]

Core classes updates (outstanding ones only)

Array

• Array#concat [Feature #12333]

Now takes multiple arguments.

• Array#max and Array#min.  [Feature #12172] 

This may cause a tiny incompatibility: if you redefine Enumerable#max and call max to an Array, your redefinition will be now ignored.  You should also redefine Array#max.

• Array#pack [Feature #12754]

Now takes optional argument `buffer:' to reuse already allocated buffer.

• Array#sum  [Feature #12217]

This is different from Enumerable#sum in that Array#sum doesn't depend on the definition of each method.

Comparable

• Comparable#clamp.  [Feature #10594]

Dir

• Dir.empty?.  [Feature #10121]

Enumerable

• Enumerable#chunk called without a block now return an Enumerator [Feature #2172]

• Enumerable#sum  [Feature #12217]

• Enumerable#uniq  [Feature #11090]

Enumerator::Lazy

• Enumerator::Lazy#chunk_while  [GH-1186]

• Enumerator::Lazy#uniq  [Feature #11090]

File

• File.empty?.  [Feature #9969]

Float

• Float#ceil, Float#floor, and Float#truncate now take an optional digits, as well as Float#round. [Feature #12245]

• Float#round now takes an optional keyword argument, half option, and the default behavior is round-up.  [Bug #12548] [Bug #12958]

• half option can be one of :even, :up, and :down.  [Feature #12953]

Hash

• Hash#compact and Hash#compact!  [Feature #11818]

• Hash#transform_values and Hash#transform_values!  [Feature #12512]

Integer

• Fixnum and Bignum are unified into Integer  [Feature #12005]

• Integer#ceil, Integer#floor, and Integer#truncate now take an optional digits, as well as Integer#round.  [Feature #12245]

• Integer#digits for extracting columns of place-value notation [Feature #12447]

• Integer#round now takes an optional keyword argument, half option, and the default behavior is round-up now.  [Bug #12548] [Bug #12958]

• half option can be one of :even, :up, and :down.  [Feature #12953]

IO

• IO#gets, IO#readline, IO#each_line, IO#readlines, IO.foreach now takes an optional keyword argument, chomp flag.  [Feature #12553]

Kernel

• Kernel#clone now takes an optional keyword argument, freeze flag. [Feature #12300]

MatchData

• MatchData#named_captures [Feature #11999]

• MatchData#values_at supports named captures [Feature #9179]

Module

• Module#refine accepts a module as the argument now. [Feature #12534]

• Module.used_modules [Feature #7418]

Numeric

• Numeric#finite?, Numeric#infinite? [Feature #12039]

Process

• Support CLOCK_MONOTONIC_RAW_APPROX, CLOCK_UPTIME_RAW, and CLOCK_UPTIME_RAW_APPROX which are introduced by macOS 10.12.

完整更新内容和发布主页

下载地址

• Source code (zip)

• Source code (tar.gz)