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

Muse M james.lei65 at gmail.com
Thu Apr 6 07:43:51 CDT 2017

I accept "contains" for at least match one result, similar to OR.
"containsOnly" is similar to AND for one element or more elements must
contain same values and types.

On Thursday, April 6, 2017, Xiaodi Wu via swift-evolution <
swift-evolution at swift.org> wrote:

> 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
> <javascript:_e(%7B%7D,'cvml','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
>> <javascript:_e(%7B%7D,'cvml','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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