From: merch-redmine@jeremyevans.net
To: ruby-core@ruby-lang.org
Subject: [ruby-core:95510] [Ruby master Feature#16275] Revert `.:` syntax
Date: Wed, 23 Oct 2019 18:04:42 +0000 (UTC) [thread overview]
Message-ID: <redmine.journal-82286.20191023180442.f25d1995dea1329a@ruby-lang.org> (raw)
In-Reply-To: redmine.issue-16275.20191023152613@ruby-lang.org
Issue #16275 has been updated by jeremyevans0 (Jeremy Evans).
I am in favor of removing `.:`. It was introduced before numbered parameters, but I think using numbered parameters is better than using `.:` for solving the same problems `.:` is designed to solve:
```ruby
%w'file1 file2'.map(&File.:read)
%w'file1 file2'.map{File.read(_1)}
%w'file1 file2'.map(&File.:read << 'dir/'.:+)
%w'file1 file2'.map{File.read('dir/'+_1)}
```
nobu (Nobuyoshi Nakada) wrote:
> It is not just for “the functional programming style”.
> Originally it was to extract the exact method even if `obj.method` was overridden.
You can use `::Kernel.instance_method(:method).bind_call(obj, :method_name)` if you really need this if `obj.method` is overridden. That's definitely more verbose, but I don't think this need is common enough that we need a shortcut for it.
----------------------------------------
Feature #16275: Revert `.:` syntax
https://bugs.ruby-lang.org/issues/16275#change-82286
* Author: naruse (Yui NARUSE)
* Status: Open
* Priority: Normal
* Assignee:
* Target version:
----------------------------------------
`obj.:method` is introduced at r66667 by #12125 and #13581.
It encourages the functional programming style in Ruby.
But this shorthand syntax is just for methods of `self` without arguments.
It causes another feature requests like #16273 (and lambda compositions like #15428).
Such features will introduce a new view of Ruby but no one illustrates the whole picture yet.
I worried about such patch work may cause a conflict with future expansion of functional programing style or a just a garbage feature.
`.:` syntax is introduced in 2.7.0 preview1, not released in production yet.
How about reverting at this time and re-introduce with a big picture.
--
https://bugs.ruby-lang.org/
next prev parent reply other threads:[~2019-10-23 18:04 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <redmine.issue-16275.20191023152613@ruby-lang.org>
2019-10-23 15:26 ` [ruby-core:95502] [Ruby master Feature#16275] Revert .: syntax naruse
2019-10-23 16:50 ` [ruby-core:95505] [Ruby master Feature#16275] Revert `.:` syntax nobu
2019-10-23 16:51 ` [ruby-core:95506] " nobu
2019-10-23 17:37 ` [ruby-core:95507] " shevegen
2019-10-23 18:04 ` merch-redmine [this message]
2019-10-23 18:29 ` [ruby-core:95511] " daniel
2019-10-23 23:19 ` [ruby-core:95518] " mame
2019-10-24 1:33 ` [ruby-core:95521] " shannonskipper
2019-10-24 6:03 ` [ruby-core:95526] " zn
2019-10-24 11:26 ` [ruby-core:95531] " eregontp
2019-10-24 14:09 ` [ruby-core:95532] " daniel
2019-10-24 18:45 ` [ruby-core:95534] " manga.osyo
2019-10-25 14:42 ` [ruby-core:95547] " zverok.offline
2019-10-25 18:37 ` [ruby-core:95549] " daniel
2019-10-25 23:28 ` [ruby-core:95556] " tim
2019-10-26 2:44 ` [ruby-core:95558] " daniel
2019-10-26 7:02 ` [ruby-core:95560] " merch-redmine
2019-10-26 7:17 ` [ruby-core:95561] " nobu
2019-10-26 12:09 ` [ruby-core:95563] " shevegen
2019-10-29 11:05 ` [ruby-core:95580] " tim
2019-10-30 23:11 ` [ruby-core:95596] " XrXr
2019-11-05 11:38 ` [ruby-core:95694] " maciej
2019-11-05 11:38 ` [ruby-core:95695] " maciej
2019-11-13 5:23 ` [ruby-core:95829] " zverok.offline
2019-11-13 11:15 ` [ruby-core:95840] " matz
2019-11-13 11:18 ` [ruby-core:95842] " matz
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