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

[Radosław Pietruszewski]

+1. Like others, this was one of the first stdlib extensions I’ve put into my Swift projects. It’s very common to want to find the first matching element in an array (or, perhaps even more common, find what you know if the only matching element — `filter` without the extra step of unpacking the value from array.)

It’s also common in other languages, and `find` is a good name.

— Radek

> On 30 Dec 2015, at 03:38, 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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