Issue #11286 has been updated by Shyouhei Urabe.


We looked at this issue in today's developer meeting.

Attendees were positive about the proposed functionality.  But Matz wanted separate method(s) than to extend all? etc, like we have separate select and grep methods.

----------------------------------------
Feature #11286: [PATCH] Add case equality arity to Enumerable's sequence predicates.
https://bugs.ruby-lang.org/issues/11286#change-62192

* Author: D.E. Akers
* Status: Open
* Priority: Normal
* Assignee: Yukihiro Matsumoto
* Target version: 
----------------------------------------
## Proposal
It is proposed that `Enumerable`'s sequence predicates (`#all?`, `#any?`, `#none?`, and `#one?`) be augmented to return, in the case of a single argument, whether their query holds when each element is supplied to the argument's `#===` method.

## Rationale
`Enumerable#grep` filters by case equality, allowing us to write very natural and expressive code:

```ruby
strs.select { |str| /foo/ === str }
strs.grep(/foo/)

nums.select { |num| (5..10) === num }
nums.grep(5..10)
```

In addition to taking advantage of the versatility of case equality, it lets us do away with the syntactic noise incurred by opening a block. `#grep` is a very nice method! Let's make `#all?` and friends more like `#grep`.

---Files--------------------------------
0001-enum.c-add-case-equality-arity-to-sequence-predicates.patch (10 KB)
case_equality_sequence_predicates-check_argc_before_deref.patch (10 KB)
case_equality_sequence_predicates-all_updates.patch (9.94 KB)


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

Unsubscribe: <mailto:ruby-core-request / ruby-lang.org?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>