[ruby-core:69685] [Ruby trunk - Feature #11286] [PATCH] Add case equality arity to Enumerable's sequence predicates.

[nobu@ruby-lang.org]

Issue #11286 has been updated by Nobuyoshi Nakada.


> ~~~diff
> +    struct MEMO *memo = MEMO_NEW(Qtrue, *argv, 0);
> +    rb_check_arity(argc, 0, 1);

Why dereference `argv` before checking `argc`.

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Feature #11286: [PATCH] Add case equality arity to Enumerable's sequence predicates.
https://bugs.ruby-lang.org/issues/11286#change-53061

* Author: D.E. Akers
* Status: Open
* Priority: Normal
* Assignee: Yukihiro Matsumoto
----------------------------------------
## 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)


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