gistfile1.java

// holy verbosity, batman, is this (Java):

someObj.getObservable()
    .switchMap(new Func1<Void, Observable<Void>>()
    {
        @Override
        public Observable<Void> call(Void _)
        {
            return someObj.getUserObservable()
                .map(new Func1<User, Void>()
                {
                    @Override
                    public Void call(User _)
                    {
                        return null;
                    }
                }
        }
    }



// ...really equivalent to this (C#):
someObj.Observable
    .SelectMany(_ => someObj.UserObservable)
    .Select(_ => Unit.Default);