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Enumerator::Yielder#to_proc -> Proc (24307.0)

• 2.7.0
• 3.0
• 3.1
• 3.2
• 3.3

• インスタンスメソッド

Enumerator.new で使うメソッドです。

...ielder#yield に渡す Proc を返します。
これは Enumerator::Yielder オブジェクトを他のメソッドにブロック引数と
して直接渡すために使えます。

//emlist[例][ruby]{
text = <<-END
Hello
こんにちは
END

enum = Enumerator.new do |y|
text.each_line(&y)
end...

...enum.each do |line|
p line
end
# => "Hello\n"
# "こんにちは\n"
//}...

• Enumerator::Yielder
• Proc

NEWS for Ruby 3.0.0 (330.0)

• 3.0
• 3.1
• 3.2
• 3.3

• 文書

NEWS for Ruby 3.0.0 このドキュメントは前回リリース以降のバグ修正を除くユーザーに影響のある機能の変更のリストです。

...Keyword arguments are now separated from positional arguments.
Code that resulted in deprecation warnings in Ruby 2.7 will now
result in ArgumentError or different behavior. 14183
* Procs accepting a single rest argument and keywords are no longer
subject to autosplatting. This now m...

...vior of Procs
accepting a single rest argument and no keywords.
16166

//emlist[][ruby]{
pr = proc{|*a, **kw| [a, kw]}

pr.call([1])
# 2.7 => [[1], {}]
# 3.0 => [[[1]], {}]

pr.call([1, {a: 1}])
# 2.7 => [[1], {:a=>1}] # and deprecation warning
# 3.0 => a=>1}, {}]
//}

* Arguments forwardi...

...leading arguments.
16378

//emlist{
def method_missing(meth, ...)
send(:"do_#{meth}", ...)
end
//}

* Pattern matching (`case/in`) is no longer experimental. 17260
* One-line pattern matching is redesigned. [EXPERIMENTAL]
* `=>` is added. It can be used like a rightward assign...