[swift-evolution] [Review] Add a Lazy flatMap for Sequences of Optionals

[Max Moiseev]

FWIW: Strictly speaking Option in Scala is not a collection. It happens to have all the methods that make it look like one and also an implicit conversion that creates a List of zero or one element. Which is kind of what Dave suggests.

> On Dec 15, 2015, at 7:21 PM, Rob Mayoff via swift-evolution <swift-evolution at swift.org> wrote:
> 
> What's the advantage?  Why would we want to have a type that is isomorphic to Optional, except that conforms to CollectionType?
> 
> My question (apologies if it has been answered already) is: Why isn't Optional a CollectionType, like it is in Scala?
> 
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