From: non.dmitriy@...
Date: 2019-11-11T15:02:27+00:00
Subject: [ruby-core:95789] [Ruby master Bug#16341] Proposal: Set#to_proc

Issue #16341 has been reported by Nondv (Dmitriy Non).

----------------------------------------
Bug #16341: Proposal: Set#to_proc
https://bugs.ruby-lang.org/issues/16341

* Author: Nondv (Dmitriy Non)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
``` 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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