Software engineer, author of the following Javascript book: https://www.newline.co/courses/advanced-javascript-unleashed
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"We can also use the this keyword from childCase to access the parent this object." - Nice article Rahul but i want to point something out: reason why you shouldn't use "this" to access the parent class is not because of readability, it's because it can cause infinite recursion if you have at-least 3 classes in the inheritance hierarchy: A -> B -> C.