Hey there Codeacademy Staff,
I recently had to learn more about what is meant by Polymorphism in programming and looking around the web for practical Javascript examples I instead found mostly theoretical explanations. I eventually found what suited my learning ability but it was a long search.
I seem to understand that Polymorphism is a topic directly connected with objects and inheritance. Two features that Javascript has. I think a lesson with relative exercise would make a good addition to your Learn Javascript course. I’m thinking a good fit would be, maybe, just around the School Catalogue exercise, adding a couple of lessons before it and a few more steps in the exercise itself.
Cheers 