public static IObservable <B> MatchObservable <A, B>(this Option <A> ma, Func <A, IObservable <B> > Some, Func <IObservable <B> > None) =>
ma.IsSome
? Some(ma.Cast()).Select(CheckNullSomeReturn)
: None().Select(CheckNullNoneReturn);
public static IObservable <A> ToObservable <A>(this Option <A> ma) =>
ma.IsSome
? Observable.Return(ma.Cast())
: Observable.Empty <A>();
public Option <R> Map <R>(Func <T, R> mapper) =>
IsSome
? Option.Cast <R>(mapper(Value))
: Option <R> .None;
