[ruby-core:92469] [Ruby trunk Bug#15745] There is no symmetry in the beginless range and the endless range using `Range#inspect`

[eregontp@gmail.com]

Issue #15745 has been updated by Eregon (Benoit Daloze).


mame (Yusuke Endoh) wrote:
> a beginless range has only one use case (DSL-like usage)

I'm not sure what you mean by DSL-like usage, but I wouldn't be surprised if many people use like `array[..-2]` (instead of `array[0..-2]`).
In other words, I'd expect it's approximately as common as endless ranges for the purpose of indexing a sequence.



----------------------------------------
Bug #15745: There is no symmetry in the beginless range and the endless range using `Range#inspect`
https://bugs.ruby-lang.org/issues/15745#change-77817

* Author: koic (Koichi ITO)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.7.0dev (2019-04-03 trunk 67423) [x86_64-darwin17]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
The following commit introduces beginless range.
https://github.com/ruby/ruby/commit/95f7992b89efd35de6b28ac095c4d3477019c583

```
% ruby -v
ruby 2.7.0dev (2019-04-03 trunk 67423) [x86_64-darwin17]
```

There is no symmetry with endless range when using `Range#inspect` method.

```
(1..).inspect # => "1.."
(..5).inspect # => "nil..5"
```

How about unifying whether it represents `nil`?




-- 
https://bugs.ruby-lang.org/