[ruby-core:83969] [Ruby trunk Feature#11286] [PATCH] Add case equality arity to Enumerable's sequence predicates.

Issue #11286 has been updated by matz (Yukihiro Matsumoto).


OK, I made a decision. I took option 1 above as proposed.
We can do as following:

~~~
[1, 3.14, 2ri].all?(Numeric) # => true

if should_be_all_symbols.any?(String)
  ...
end

some_strings.none?(/aeiou/i)

~~~

Matz.

----------------------------------------
Feature #11286: [PATCH] Add case equality arity to Enumerable's sequence predicates.
https://bugs.ruby-lang.org/issues/11286#change-68037

* Author: 0x0dea (D.E. Akers)
* Status: Open
* Priority: Normal
* Assignee: matz (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:[e-mail]?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>