From: mail@...
Date: 2019-02-15T10:39:59+00:00
Subject: [ruby-core:91561] [Ruby trunk Feature#15606] Precedence of -@ and +@

Issue #15606 has been updated by sos4nt (Stefan Sch����ler).


nobu (Nobuyoshi Nakada) wrote:
> Do you expect `i = -1; -i.abs` to return `+1`?

Yes, indeed. I'd expect `<something>.abs` to return a positive value.

```ruby
 1.abs #=> 1
-1.abs #=> 1

i = 1

 i.abs #=> 1
-i.abs #=> -1  <- not what I'd expect
```

----------------------------------------
Feature #15606: Precedence of -@ and +@
https://bugs.ruby-lang.org/issues/15606#change-76824

* Author: sos4nt (Stefan Sch����ler)
* Status: Feedback
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
`-@` and `+@` seem to have issues with method chaining:

```ruby
i = 5

-i.negative?
# NoMethodError (undefined method `-@' for false:FalseClass)
```

here's another example:

```ruby
# frozen_string_literal: true

+'foo'.upcase!
# FrozenError (can't modify frozen String)
```

I know that I can fix this by adding parentheses, i.e. `(-i).negative?` and `(+'foo').upcase!` but it feels cumbersome.

Shouldn't the above work out of the box?

Unless I'm missing a crucial use case, the precedence for `-@` and `+@` should be changed.



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