Issue #16341 has been updated by zverok (Victor Shepelev).


Since 2.5, `Set` implements `#===`, so you can just:

```ruby
(1..10).grep_v(banned_numbers)
# => [1, 2, 3, 4, 6, 8, 10] 
```
which is pretty clear and probably more effective than proc conversion.

----------------------------------------
Feature #16341: Proposal: Set#to_proc
https://bugs.ruby-lang.org/issues/16341#change-82611

* Author: Nondv (Dmitry Non)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
``` ruby
class Set
  def to_proc
    -> (x) { include?(x) } # or method(:include?).to_proc
  end
end
```

Usage:

```ruby
require 'set'

banned_numbers = Set[0, 5, 7, 9]
(1..10).reject(&banned_numbers) # ===> [1, 2, 3, 4, 6, 8, 10]
```



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