Super works without classes

[martinheidegger]

As far as I understand the "super" keyword works in ES6 even on objects that are no classes. (using proto) but the code of "class extend" suggests that it only works for classes.

[yosuke-furukawa]

super word is declared in ES6.
yes, of course you can use super without class. But I would like to tell about extend in the exercise.
super is not explained a lot here.

If i should explain super in detail, I should add another exercise about super.