From: nobu@ruby-lang.org
To: ruby-core@ruby-lang.org
Subject: [ruby-core:71330] [Ruby trunk - Feature #11653] Add to_proc on Hash
Date: Wed, 04 Nov 2015 06:01:52 +0000 [thread overview]
Message-ID: <redmine.journal-54704.20151104060152.b076d8909f7bcb29@ruby-lang.org> (raw)
In-Reply-To: redmine.issue-11653.20151104025915@ruby-lang.org
Issue #11653 has been updated by Nobuyoshi Nakada.
Description updated
You can write it as:
~~~ruby
[:e, :a, :b, :f, :c, :d].map(&my_hash.method(:[]))
~~~
----------------------------------------
Feature #11653: Add to_proc on Hash
https://bugs.ruby-lang.org/issues/11653#change-54704
* Author: Daniel P. Clark
* Status: Open
* Priority: Normal
* Assignee: Yukihiro Matsumoto
----------------------------------------
Procs can be called the same way a hash is with `[]`. But a Hash is not mappable as a Proc.
~~~ruby
my_hash = ->key{{
a: 1, b: 2, c: 3, d: 4, e: 5, f: 6
}[key]}
my_hash[:a]
# => 1
[:e, :a, :b, :f, :c, :d].map(&my_hash) # hash is now mappable
# => [5, 1, 2, 6, 3, 4]
~~~
This seems so straight forward I believe it should be part of the language itself with the `.to_proc` method call.
--
https://bugs.ruby-lang.org/
next prev parent reply other threads:[~2015-11-04 5:33 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <redmine.issue-11653.20151104025915@ruby-lang.org>
2015-11-04 2:59 ` [ruby-core:71327] [Ruby trunk - Feature #11653] [Open] Add to_proc on Hash 6ftdan
2015-11-04 5:24 ` [ruby-core:71329] [Ruby trunk - Feature #11653] " duerst
2015-11-04 6:01 ` nobu [this message]
2015-11-09 8:03 ` [ruby-core:71404] " matz
2015-11-09 14:32 ` [ruby-core:71416] Unsubscribe Dan Whiteside
2015-11-09 8:08 ` [ruby-core:71405] [Ruby trunk - Feature #11653] Add to_proc on Hash ko1
2016-06-24 8:34 ` [ruby-core:76135] [Ruby trunk Feature#11653] " Ruby-Lang
2016-06-25 5:01 ` [ruby-core:76140] " duerst
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-list from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.ruby-lang.org/en/community/mailing-lists/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=redmine.journal-54704.20151104060152.b076d8909f7bcb29@ruby-lang.org \
--to=ruby-core@ruby-lang.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).