Clarification for Law of Demeter

[Sahilgat]

Hi, can I check why the example given in the lecture below does not violate Law of Demeter while the second screenshot given below that in the textbook does violate the law? Based on my understanding, it's because b.getGoo() method in the textbook may not be creating a new Goo object in the getGoo() method. Am I right to say if getGoo() creates a new Goo object which it returns, will it not violate the Law of Demeter (based on the example in the lecture)?

[LiuZechu]

If I'm not mistaken, the Law of Demeter is violated if you access an object in the internal structure of what the method receives as a parameter. In the lecture's example, the Label object doesn't reside in i's internal structure, but instead it's newly created. I think what you mentioned about "if getGoo() creates a new Goo object which it returns, will it not violate the Law of Demeter" is right.

However, a method that looks like getSomething() is probably a getter method that returns an attribute of the object being called.

[damithc]

Both @Sahilgat's initial speculation and @LiuZechu's answer are correct 👍 It's based on the assumption that getGoo() is returning an internal object rather than a new object.

[Sahilgat]

Thanks for the clarification!