[ruby-core:114845] [Ruby master Feature#13933] Add Range#empty?

Issue #13933 has been updated by Dan0042 (Daniel DeLorme).


Since 6 years ago, beginless and endless ranges have been added, so `#none?` is no longer sufficient.

```ruby
(nil..0).none?  #=> TypeError (can't iterate from NilClass)
```

And as mentioned above `Range#size` doesn't work for String ranges.

So I think it would be good to have `Range#empty?`, with cover-based semantics rather than succ-based:

```ruby
(1..0).empty?                #=> true
(1..1).empty?                #=> false
(1...1).empty?               #=> true
("a".."b").empty?            #=> false
("b".."a").empty?            #=> true
(nil..0).empty?              #=> false  
(..-Float::INFINITY).empty?  #=> false  
(...-Float::INFINITY).empty? #=> true
```

----------------------------------------
Feature #13933: Add Range#empty?
https://bugs.ruby-lang.org/issues/13933#change-104692

* Author: ted (Ted Johansson)
* Status: Open
* Priority: Normal
----------------------------------------
Range already responds to #size. It would be nice if it also responded to predicate #empty? :-)



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