[ruby-core:74333] [Ruby trunk Feature#12133][Feedback] Ability to exclude start when defining a range

Issue #12133 has been updated by Shyouhei Urabe.

Status changed from Open to Feedback

Do you have any practical situation where this is useful?  The proposed grammar is ultra-hard to implement at sight (if not impossible).  You are advised to show us why this feature is worth tackling.

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Feature #12133: Ability to exclude start when defining a range
https://bugs.ruby-lang.org/issues/12133#change-57457

* Author: Ryan Hosford
* Status: Feedback
* Priority: Normal
* Assignee: 
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An intuitive, approach would be to allow defining ranges like so:

~~~
[1..10]
[1..10)
(1..10]
(1..10)
~~~

... where a square bracket indicates boundary inclusion and a parenthesis represents boundary exclusion. The syntax there is obviously not going to work, but it demonstrates the idea.

A more feasible, still intuitive, solution might look like the following

~~~
(1..10)                # [1..10]
(1...10)               # [1..10) ... Alternatively: (1..10).exclude_end
(1..10).exclude_start  # (1..10]
(1...10).exclude_start # (1..10) ... Alternatively: (1..10).exclude_start.exclude_end
~~~

For consistency, I think we'd also want to add `#exclude_start?` & `#exclude_end` methods.



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