From: "sawa (Tsuyoshi Sawada) via ruby-core" <ruby-core@...>
Date: 2023-04-28T04:58:32+00:00
Subject: [ruby-core:113370] [Ruby master Feature#19559] Introduce `Symbol#+@` and `Symbol#-@`, and eventually replace boolean arguments with symbols

Issue #19559 has been updated by sawa (Tsuyoshi Sawada).





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Feature #19559: Introduce `Symbol#+@` and `Symbol#-@`, and eventually replace boolean arguments with symbols

https://bugs.ruby-lang.org/issues/19559#change-102936



* Author: sawa (Tsuyoshi Sawada)

* Status: Rejected

* Priority: Normal

----------------------------------------

I propose to define `Symbol#+@` and `Symbol#-@`, so that we can add positive or negative polarity to symbols. A possible implementation can be equivalent to what can be achieved by this:



```ruby

class Symbol

  def -@; "-#{self}".to_sym end

  def +@; self end

end

```



The intention behind this is to, eventually, replace boolean positional or keyword arguments with symbols so that, instead of this:



```ruby

"foo".methods(false)



gets(chomp: true)



Integer("2.3", exception: false)

```



we can write like this:



```ruby

"foo".methods(-:inherit)



gets(+:chomp)



Integer("2.3", -:exception)

```







-- 

https://bugs.ruby-lang.org/

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