From: "danh337 (Dan H)" <noreply@ruby-lang.org>
To: ruby-core@ruby-lang.org
Subject: [ruby-core:107662] [Ruby master Feature#16295] Chainable aliases for String#-@ and String#+@
Date: Fri, 18 Feb 2022 22:48:47 +0000 (UTC) [thread overview]
Message-ID: <redmine.journal-96576.20220218224847.7941@ruby-lang.org> (raw)
In-Reply-To: redmine.issue-16295.20191105134410.7941@ruby-lang.org
Issue #16295 has been updated by danh337 (Dan H).
@Eregon how is `-@` different from `.freeze` ? The meaning of these seems very much the same.
----------------------------------------
Feature #16295: Chainable aliases for String#-@ and String#+@
https://bugs.ruby-lang.org/issues/16295#change-96576
* Author: byroot (Jean Boussier)
* Status: Open
* Priority: Normal
----------------------------------------
Original discussion https://bugs.ruby-lang.org/issues/16150?next_issue_id=16147&prev_issue_id=16153#note-40
In #16150, @headius raised the following concern about `String#-@` and `String#+@`:
headius (Charles Nutter) wrote:
> > Not exactly, -@ and +@ makes this much simpler
>
> I do like the unary operators, but they also have some precedence oddities:
>
> ```
> >> -"foo".size
> => -3
> >> (-"foo").size
> => 3
> ```
>
> And it doesn't work at all if you're chaining method calls:
>
> ```
> >> +ary.to_s.frozen?
> NoMethodError: undefined method `+@' for false:FalseClass
> from (irb):8
> from /usr/bin/irb:11:in `<main>'
> ```
>
> But you are right, instead of the explicit `dup` with possible freeze you could use `-` or `+` on the result of `to_s`. However it's still not safe to modify it since it would modify the original string too.
After working for quite a while with those, I have to say I agree. They very often force to use parentheses, which is annoying, and an indication that regular methods would be preferable to unary operators.
In response @matz proposed to alias them as `String#+` and `String#-` without arguments:
> How about making String#+ and #- without argument behave like #+@ and #-@ respectively, so that we can write:
>
> ```
> "foo".-.size
> ary.to_s.+.frozen?
> ```
My personal opinion is that descriptive method names would be preferable to `+/-`:
> IMHO `.-` and `.+` is not very elegant. Proper method names explaining the intent would be preferable.
>
> - `-@` could be `dedup`, or `deduplicate`.
> - `+@` could be `mutable` or `mut`.
--
https://bugs.ruby-lang.org/
next prev parent reply other threads:[~2022-02-18 22:48 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <redmine.issue-16295.20191105134410.7941@ruby-lang.org>
2021-03-30 21:12 ` [ruby-core:103113] [Ruby master Feature#16295] Chainable aliases for String#-@ and String#+@ dan
2021-03-30 21:31 ` [ruby-core:103114] " dan
2021-03-30 21:52 ` [ruby-core:103115] " merch-redmine
2021-03-30 23:11 ` [ruby-core:103116] " eregontp
2022-02-18 22:41 ` [ruby-core:107661] " danh337 (Dan H)
2022-02-18 22:48 ` danh337 (Dan H) [this message]
2022-02-19 20:34 ` [ruby-core:107667] " Eregon (Benoit Daloze)
2022-02-19 20:39 ` [ruby-core:107668] " Eregon (Benoit Daloze)
2022-02-19 23:44 ` [ruby-core:107669] " zverok (Victor Shepelev)
2022-02-20 1:49 ` [ruby-core:107670] " phluid61 (Matthew Kerwin)
2022-02-20 12:39 ` [ruby-core:107671] " Eregon (Benoit Daloze)
2022-02-21 8:46 ` [ruby-core:107681] " byroot (Jean Boussier)
2022-02-21 10:57 ` [ruby-core:107683] " byroot (Jean Boussier)
2022-02-21 19:04 ` [ruby-core:107691] " danh337 (Dan H)
2022-02-21 19:35 ` [ruby-core:107695] " danh337 (Dan H)
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