Temp 2 - Realm

1. Creating Observable

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Observable.<String>create(s ->{
s.onNext("I created succesfully");
s.onComplete();
});
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2. Creating Observable and do some work

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Observable.<String>create(s ->{

            String calc1 = doSomething();
            s.onNext(calc1);
         
            String calc2 = doSomeOtherthing();
            s.onNext(calc2);
         
         
            s.onComplete();
        });

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3. Map

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Observable.just(1,2,3,4)
.map(x -> x+" text")   or   .map(x -> x+1)
.subscribe(System.out::println);
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