[ruby-core:105012] [Ruby master Feature#12075] some container#nonempty?

Issue #12075 has been updated by austin (Austin Ziegler).


I’m not entirely sure we need a new method for this, because we could always use `ary.size.nonzero?` or `ary.size.positive?`. It is also possible to tell the difference between an empty vs non-empty array with `[nil].any? { true }` and `[].any? { true }`. The advantage to `#size.nonzero?` or `#size.positive?` is that it works on String, Hash, and Array. It might work on a lot of enumerables, but only if they respond to `#size` and `#size` doesn’t require enumeration. It even works on endless ranges (`(3..).size.positive?`).

Of the suggested methods, I think I like `#nonempty?` best, and `#size?` second-best. I like `#some?` least because it is confusing with `any?`.

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Feature #12075: some container#nonempty?
https://bugs.ruby-lang.org/issues/12075#change-93415

* Author: naruse (Yui NARUSE)
* Status: Feedback
* Priority: Normal
* Assignee: matz (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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