How would you write
for x in array as? <something>
With parentheses? I like "in?" because it mimics "as?".
Sent from my iPhone
> On Feb 10, 2017, at 13:57, Jacob Bandes-Storch <jtban...@gmail.com> wrote:
>
> To me it would seem more logical as "for x in array? { }" — to parallel "for
> case let x? in array { }"
>
>
>> On Fri, Feb 10, 2017 at 1:03 PM, Rick Mann via swift-users
>> <swift-users@swift.org> wrote:
>> I love the idea of for in? (Or even for? In). You should pitch that to
>> evolution.
>>
>> Sent from my iPhone
>>
>>> On Feb 10, 2017, at 07:04, Tino Heth <2...@gmx.de> wrote:
>>>
>>>
>>>> Is there any concise way to write the following?
>>>>
>>>> if let collection = someOptionalCollection
>>>> {
>>>> for item in collection
>>>> {
>>>> }
>>>> }
>>> I've been thinking about that lately, but haven't had the time to look
>>> wether someone on evolution already proposed a "for in?"-loop…
>>>
>>> Imho the "forEach" solution is flawed, because you can't break the loop,
>>> and the "?? []" isn't perfect either:
>>> I hope the compiler can optimise so that the assembly is as fast as the "if
>>> let" solution, but even if this is the case, it is not obvious for a human
>>> reader.
>>>
>>> This
>>>
>>> extension Optional where Wrapped: Sequence {
>>> var elements: [Wrapped.Iterator.Element] {
>>> switch (self) {
>>> case .none:
>>> return []
>>> case .some(let o):
>>> return Array(o)
>>> }
>>> }
>>> }
>>>
>>> let test: [Int]? = nil
>>> for i in test.elements {
>>> print(i)
>>> }
>>>
>>> looks nice to me (except the return type — I guess there are better
>>> options), but I don't expect that the compiler can do much to optimise it.
>>>
>>> for i in? test {
>>> print(i)
>>> }
>>>
>>> Imho looks even better, but this would need an extension of the language
>>> itself…
>>>
>>
>> _______________________________________________
>> swift-users mailing list
>> swift-users@swift.org
>> https://lists.swift.org/mailman/listinfo/swift-users
>>
>
_______________________________________________
swift-users mailing list
swift-users@swift.org
https://lists.swift.org/mailman/listinfo/swift-users
