[swift-evolution] Add an ifPresent function to Optional

[Tikitu de Jager]

+1 -- I've used the "an optional is a collection with max 1 element" 
rhetoric to explain map/flatMap, would be great if this was true instead 
of "morally true".

> @Dave,Yes, CollectionType would be better than SequenceType.
>
> On Saturday, 12 March 2016, Dave via 
> swift-evolution<swift-evolution at swift.org(mailto:swift-evolution at swift.org)>wrote:
> > +1.
> >
> > I’d go so far as to suggest that maybe Optional should conform to 
> CollectionProtocol, since you can pretty easily think of an Optional 
> as a collection that can’t have more than one element.
> >
> > - Dave Sweeris
> >
> > > On Mar 10, 2016, at 7:32 PM, Erica Sadun via 
> swift-evolution<swift-evolution at swift.org(javascript:_e(%7B%7D,'cvml','swift-evolution at swift.org');)>wrote:
> > >
> > > While I'm not convinced of the utility or lack thereof, wouldn't 
> it make more sense
> > > to extend `forEach` to support optionals in a similar way that map 
> and flapMap
> > > currently do rather than introduce `ifPresent`?
> > >
> > > lety:Int? =1
> > > letn:Int? =nil
> > >
> > > _=y.map({print($0) }) // works in current Swift
> > > _=n.map({print($0) }) // ditto
> > >
> > >
> > > y.forEach{ print($0) } // not currently a thing
> > > n.forEach{ print($0) } // ditto
> > >
> > > Just spitballing here.
> > >
> > > -- E
> > >
> > > _______________________________________________
> > > swift-evolution mailing list
> > > 
> swift-evolution at swift.org(javascript:_e(%7B%7D,'cvml','swift-evolution at swift.org');)
> > > https://lists.swift.org/mailman/listinfo/swift-evolution
> --
> -- Howard.
>
>
>