[ruby-core:83066] [Ruby trunk Feature#13395] Add a method to check for not nil

Issue #13395 has been updated by MSP-Greg (Greg L).


I believe the english equivalent to `not_nil` would be `exist` (instead of exists, to follow prev use).  I believe core only uses `exist?` with `Dir`, `File`, and `FileTest`.

Having it would allow showing the standard case first in an if-else-end structure, given that unless-else-end may be considered 'strange' code.

Also, I'm sure many of us have used a tri-state nil/false/true variable when it is helpful.

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Feature #13395: Add a method to check for not nil
https://bugs.ruby-lang.org/issues/13395#change-67006

* Author: JustJosh (Joshua Stowers)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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There does not seem to be a method in Ruby to check if an object is *not* nil.
Such a method could help with readability.

Example:
> ~~~ ruby
> array = [1, 'dog', nil]
> array.count(&:not_nil?)
> ~~~

> vs

> ~~~ ruby
> array = [1, 'dog', nil]
> array.reject(&:nil?).count
> ~~~





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