Issue #12133 has been updated by Benoit Daloze.


Ryan Hosford wrote:
> I'm not proposing we support non-matching parenthesis or brackets. Here's what I'm proposing:

Am I missing something or the ability to exclude start could be done with just (start.next..last) ?
If that's the case, it seems to be too much of an effort to add new syntax, or to complicate further Range's implementation.


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Feature #12133: Ability to exclude start when defining a range
https://bugs.ruby-lang.org/issues/12133#change-57705

* Author: Ryan Hosford
* Status: Feedback
* Priority: Normal
* Assignee: 
----------------------------------------
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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