From: ruby-core@...
Date: 2017-01-03T20:44:21+00:00
Subject: [ruby-dev:49942] [Ruby trunk Feature#13067] TrueClass, FalseClass to provide `===` to match truthy/falsy values.

Issue #13067 has been updated by Marc-Andre Lafortune.


While `:itself.to_proc` works, I still can't see when one would need it, and it's much easier and clearer to check for `nil` and `false`

```
def foo val
  case val
  when true
    'true value'
  when 1
    'one'
  when nil, false
    'falsy'
  else
    'truthy'
  end
end
```

----------------------------------------
Feature #13067: TrueClass,FalseClass to provide `===` to match truthy/falsy values.
https://bugs.ruby-lang.org/issues/13067#change-62375

* Author: Yukihiro Matsumoto
* Status: Open
* Priority: Normal
* Assignee: Yukihiro Matsumoto
* Target version: 
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I propose to make `TrueClass`, `FalseClass` to provide `===` method to match truthy values (`TrueClass`), and falsy values (`FalseClass`), so that we can use true and false for case pattern matching.  And we can pick truthy values using `grep` e.g. `ary.grep(true)`.

Matz.



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