RxSwift: FlatMap Operator

.flatMap { }

• Projects and transforms the observable values of an Observable via a supplied predicate and then flattens them down to a single observable.
• Useful to filter out nil.
• Only emits values of an observable when then observable completes.

-----YY---------------YY---YY--->

flatMap { YY -> XX}

-----XX---------------XX---XX--->

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