From: "knu (Akinori MUSHA)" <noreply@...>
Date: 2021-10-07T03:11:09+00:00
Subject: [ruby-core:105585] [Ruby master Feature#12075] some container#nonempty?

Issue #12075 has been updated by knu (Akinori MUSHA).


> Intuitively, "x.size?" is more likely interpreted as "is the size defined for x?" rather than "is the size of x greater than 0?"

When one knew `size?` always comes with `size`, one should see that asking that question does not make much sense, simply because every container instance has a size just like every file has a size, which is assumed by `File::Stat#size?`.  I already opposed adding a non-emptiness predicate method to Object/Kernel.

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Feature #12075: some container#nonempty?
https://bugs.ruby-lang.org/issues/12075#change-94055

* 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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