[ruby-core:105584] [Ruby master Feature#12075] some container#nonempty?

Issue #12075 has been updated by sawa (Tsuyoshi Sawada).


knu (Akinori MUSHA) wrote in #note-33:
> [...]`size?` [...] explicitly says it would check the size, which means it is essentially equivalent to `size > 0`

While this might make sense in JavaScript, given that `0` is truthy in Ruby, I do not agree with this opinion. I think the most natural definition of such method `size?` would be mapping of `size` to boolean values, which would be `true` in Ruby as long as `size` is defined (numeric), even when it is `0`.

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Feature #12075: some container#nonempty?
https://bugs.ruby-lang.org/issues/12075#change-94054

* 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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