[swift-evolution] Proposal: Add function SequenceType.find()

[Nevin Brackett-Rozinsky]

Is it worth considering a version that returns a tuple of (index, element) ?

Nevin


On Tue, Dec 29, 2015 at 9:40 PM, Keith Smiley via swift-evolution <
swift-evolution at swift.org> wrote:

> +1. We've added an extension for this and find it very useful.
> On Tue, Dec 29, 2015 at 18:38 Kevin Ballard via swift-evolution <
> swift-evolution at swift.org> wrote:
>
>> I'm proposing a new extension method on SequenceType called find(). It's
>> similar to CollectionType.indexOf() except it returns the element:
>>
>>
>> extension SequenceType {
>>
>>     /// Returns the first element where `predicate` returns `true`, or
>> `nil`
>>
>>     /// if such value is not found.
>>
>>     public func find(@noescape predicate: (Self.Generator.Element) throws
>> -> Bool) rethrows -> Self.Generator.Element? {
>>
>>         for elt in self {
>>
>>             if try predicate(elt) {
>>
>>                 return elt
>>
>>             }
>>
>>         }
>>
>>         return nil
>>
>>     }
>>
>> }
>>
>> -Kevin Ballard
>>
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>
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