From: "austin (Austin Ziegler) via ruby-core" <ruby-core@...>
Date: 2023-03-30T19:29:34+00:00
Subject: [ruby-core:113054] [Ruby master Feature#19559] Introduce `Symbol#+@` and `Symbol#-@`, and eventually replace boolean arguments with symbols

Issue #19559 has been updated by austin (Austin Ziegler).





What would be the result of the pathological cases?



```ruby

+:"-chomp"

-(-:chomp)

```



With the proposed implementation, it would be `:"-chomp"` and `:"--chomp"`, but those both feel wrong.



If we wanted to accept non-keyword arguments for `gets` and `Integer`, I would support more `:no_chomp` or `:no_exxception`.



Unless of course, this is a very early poisson d���Avril, in which case I think we need to have *more* unary operators on symbols so we can implement BF entirely with symbols.



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

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

https://bugs.ruby-lang.org/issues/19559#change-102592



* Author: sawa (Tsuyoshi Sawada)

* Status: Open

* 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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