From: "ssuda (Sambasiva Suda)" <sambasivarao@gmail•com>
To: ruby-dev@ruby-lang.org (ruby developers list)
Subject: [ruby-dev:45439] [ruby-trunk - Feature #6118] Hash#keys_of(values), returns related keys of given values
Date: Tue, 27 Mar 2012 01:44:59 +0900 [thread overview]
Message-ID: <redmine.journal-25196.20120327014458@ruby-lang.org> (raw)
In-Reply-To: redmine.issue-6118.20120306175507@ruby-lang.org
Issue #6118 has been updated by ssuda (Sambasiva Suda).
File 000_ruby_hash_keys_of.patch added
Here is the updated patch
----------------------------------------
Feature #6118: Hash#keys_of(values), returns related keys of given values
https://bugs.ruby-lang.org/issues/6118#change-25196
Author: naruse (Yui NARUSE)
Status: Open
Priority: Normal
Assignee:
Category:
Target version:
Hash#key(value) の複数版がほしいです。
{a: 1, b: 2, c: 3, d: 1}.key(1)
=> :a
というメソッドはあるのですが、
{a: 1, b: 2, c: 3, d: 1}.keys_of(1)
=> [:a, :d]
というメソッドは現状ありません。
Ruby での実装例は以下のような感じになります。
どうでしょうか。
class Hash
def keys_of(*a)
each_with_object([]) {|(k, v), r| r << k if a.include? v}
end
end
--
http://bugs.ruby-lang.org/
next prev parent reply other threads:[~2012-03-26 17:02 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-06 8:55 [ruby-dev:45310] [ruby-trunk - Feature #6118][Open] Hash#keys_of(values), returns related keys of given values Yui NARUSE
2012-03-26 16:38 ` [ruby-dev:45438] [ruby-trunk - Feature #6118] " ssuda (Sambasiva Suda)
2012-03-26 16:44 ` ssuda (Sambasiva Suda) [this message]
2012-03-29 16:54 ` [ruby-dev:45457] [ruby-trunk - Feature #6118][Assigned] " mame (Yusuke Endoh)
2012-11-20 13:18 ` [ruby-dev:46563] [ruby-trunk - Feature #6118] " mame (Yusuke Endoh)
2019-01-10 8:16 ` [ruby-dev:50758] [Ruby trunk Feature#6118][Feedback] " naruse
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