From: matz@ruby.or.jp
To: ruby-core@ruby-lang.org
Subject: [ruby-core:92772] [Ruby trunk Feature#15831] Add `Array#extract`, `Hash#extract`, and `ENV.extract`
Date: Wed, 22 May 2019 07:45:39 +0000 (UTC) [thread overview]
Message-ID: <redmine.journal-78137.20190522074539.9758acdee4e10446@ruby-lang.org> (raw)
In-Reply-To: redmine.issue-15831.20190505205201@ruby-lang.org
Issue #15831 has been updated by matz (Yukihiro Matsumoto).
Status changed from Open to Rejected
I don't think we have seen the use-case that this method is absolutely necessary. I also concern about the name conflict with the ActiveSupport method.
Let me see the real-world use-case, please.
Matz.
----------------------------------------
Feature #15831: Add `Array#extract`, `Hash#extract`, and `ENV.extract`
https://bugs.ruby-lang.org/issues/15831#change-78137
* Author: bogdanvlviv (Bogdan Denkovych)
* Status: Rejected
* Priority: Normal
* Assignee:
* Target version:
----------------------------------------
## Add `Array#extract`
The method removes and returns the elements for which the block returns a true value.
If no block is given, an Enumerator is returned instead.
```ruby
numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
odd_numbers = numbers.extract { |number| number.odd? } # => [1, 3, 5, 7, 9]
numbers # => [0, 2, 4, 6, 8]
```
This method was added to Active Support as `extract!` in https://github.com/rails/rails/pull/33137
In this post, you can find use cases of this method
https://bogdanvlviv.com/posts/ruby/rails/array-extract-to-activesupport-6-0.html
## Add `Hash#extract`
The method removes and returns the key/value pairs for which the block evaluates to +true+.
If no block is given, an Enumerator is returned instead.
```ruby
h = {a: 100, b: 200, c: 300}
h.extract {|k, v| v > 150} # => {:b=>200, :c=>300}
h # => {:a=>100}
```
Note that there is method `extract!` in Active Support that was added in 2009, see
https://github.com/rails/rails/commit/8dcf91ca113579646e95b0fd7a864dfb6512a53b
But I think we should upstream `extract!` to Ruby as `slice!`.
## Add `ENV.extract`
The method removes and returns the key/value pairs for which the block evaluates to +true+.
If no block is given, an Enumerator is returned instead.
```ruby
ENV.extract {|k, v| k == "PORT"} # => {"PORT"=>"3000"}
```
Pull Request: https://github.com/ruby/ruby/pull/2171
Patch: https://patch-diff.githubusercontent.com/raw/ruby/ruby/pull/2171.patch
--
https://bugs.ruby-lang.org/
next prev parent reply other threads:[~2019-05-22 7:45 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <redmine.issue-15831.20190505205201@ruby-lang.org>
2019-05-05 20:52 ` [ruby-core:92566] [Ruby trunk Feature#15831] Add `Array#extract!`, `Hash#extract!`, and `ENV::extract!` bogdanvlviv
2019-05-06 6:01 ` [ruby-core:92569] " shevegen
2019-05-14 0:33 ` [ruby-core:92638] [Ruby trunk Feature#15831] Add `Array#extract`, `Hash#extract`, and `ENV::extract` nobu
2019-05-14 21:24 ` [ruby-core:92649] " bogdanvlviv
2019-05-18 14:45 ` [ruby-core:92709] " bogdanvlviv
2019-05-22 7:45 ` matz [this message]
2019-05-22 9:52 ` [ruby-core:92780] [Ruby trunk Feature#15831] Add `Array#extract`, `Hash#extract`, and `ENV.extract` bogdanvlviv
2019-05-24 10:39 ` [ruby-core:92821] " bogdanvlviv
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