RxJava: How to convert List of objects to List of another objects

Question

I have the List of SourceObjects and I need to convert it to the List of ResultObjects.

I can fetch one object to another using method of ResultObject:

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Answer 1

You can use map operator. For example if you have lists of integers and you want to convert to lists of doubles:

    List li = new ArrayList<>();
    Observable.just(li).map( l -> {
        List lr = new ArrayList();
        for(Integer e:l) {
            lr.add(e.doubleValue());
        }
        return lr;
    });

But all it's a lot more natural if you can control the observable and change it to observe single elements instead of collections. Same code that converts single integer elements into double ones:

Observable.just(1,2,3).map( elem -> elem.doubleValue())