From: shevegen@...
Date: 2016-10-06T21:28:00+00:00
Subject: [ruby-core:77508] [Ruby trunk Feature#11286] [PATCH] Add case equality arity to Enumerable's sequence predicates.

Issue #11286 has been updated by Robert A. Heiler.


I like this one in particular:

    some_strings.none?(/aeiou/i)

I am not so sure about:

    nums.grep(5..10)

But I have no strong feelings either way. I do disagree with the
statement "syntactic noise incurred by opening a block" though -
blocks feel very natural in ruby to me. I guess the main part I
would agree is that the .grep(range) variant is shorter to write
than the block variant. This also reminds me of other proposals
about allowing arguments to e. g. .map(&:chomp) invocations -
I use this quite a lot myself but the & there still "feels" sort
of strange.

----------------------------------------
Feature #11286: [PATCH] Add case equality arity to Enumerable's sequence predicates.
https://bugs.ruby-lang.org/issues/11286#change-60770

* 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)
case_equality_sequence_predicates-check_argc_before_deref.patch (10 KB)
case_equality_sequence_predicates-all_updates.patch (9.94 KB)


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