[ruby-core:77412] [Ruby trunk Feature#12075] some container#nonempty?

Issue #12075 has been updated by sorah Shota Fukumori.


I know any? works on some use cases, but I'm positive to have a proposed method because using `any?` has a pitfall. We have to guarantee an array doesn't have only false or nil. Also I'm worrying users who started to use `any?` for this use case, but doesn't know this pitfall.

I'm positive on Object#not idea.

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Feature #12075: some container#nonempty?
https://bugs.ruby-lang.org/issues/12075#change-60668

* Author: Yui NARUSE
* Status: Feedback
* Priority: Normal
* Assignee: Yukihiro Matsumoto
----------------------------------------
I sometimes write following code.

```ruby
ary = some_metho_returns_nil_or_empty_container() # nil or "" or [] or {}

if ary && !ary.empty?
  #  some code
end
```

But the condition `ary && !ary.empty?` is too long and complex.
Though Ruby 2.3 introduces `&.`, but this can’t be written as `ary&.empty?`.

One idea is add `nonempty?` write as `ary&.nonempty?`.

akr: `nonempty?` is not good name because human is not good at handling 

This discussion matches following core classes:

* String
* Array
* Hash



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