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[flatMap](https://developer.apple.com/documentation/swift/sequence/2907182-flatmap#) deprecated in 9.0 [compactMap](https://developer.apple.com/documentation/swift/anybidirectionalcollection/2957784-compactmap#) introduced in iOS 9.3
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I found this convenient to have the examples ready to hand, especially before I wrapped my head around it.
I also added a
compactMapNilfor iOS 9.3+, if you like that.