[swift-users] [swift-evolution] for-else syntax

[Howard Lovatt]

Why not add to the library:

extension Sequence {
    func forEach(_ eacher: (Iterator.Element) throws -> Void, elser: ()
throws -> Void) rethrows {
        var hasIterated = false
        for element in self {
            hasIterated = true
            try eacher(element)
        }
        guard hasIterated else {
            try elser()
            return
        }
    }
}

On Fri, 3 Feb 2017 at 8:33 pm, Jeremy Pereira via swift-users <
swift-users at swift.org> wrote:

>
> > On 2 Feb 2017, at 20:12, Erica Sadun via swift-users <
> swift-users at swift.org> wrote:
> >
> > I've taken this over to Swift Users from Swift Evolution.
> >
> > I think you'd want to handle the exceptional case first,
>
> Although it is the way I would do it for an array, sometimes you don’t
> know that a sequence is empty until after you have iterated it.
>
>
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>
-- 
-- Howard.
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