[swift-evolution] [Pitch] Add an all algorithm to Sequence

[Xiaodi Wu]

In JavaScipt they are known as "every" and "includes".

In C# they are "TrueForAll" and "Exists".

Not sure why "all" and "contains" is any less consistent.
On Thu, Apr 6, 2017 at 05:50 Víctor Pimentel Rodríguez via swift-evolution <
swift-evolution at swift.org> wrote:

> On Thu, Apr 6, 2017 at 12:44 AM, Jonathan Hull via swift-evolution <
> swift-evolution at swift.org> wrote:
>
> On that note: ‘containsOnly' is still my favorite by a wide margin.  I
> know it is longer than ‘all’, but it’s behavior is much clearer (especially
> for those of us who have never used or heard of ‘all’ in other languages),
> and it’s relationship with ‘contains’ is also very clear.
>
>
> Also +1 to containsOnly for this very reason.
>
> In other languages (Python, Ruby, etc) that have an `all` method, they
> also have an `any` method, thus maintaining certain consistency.
>
> In the Swift standard library that `any` method is called `contains`, so
> `containsOnly` matches nicely that consistency.
>
> --
> Víctor Pimentel
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