Found a bug and fixed the version that the previous posts point to: Class.js
Basically, the callSuper would not work if the method was not implemented at the beginning of the chain. For example if you have classes A, B, and C, (where B extends A and C extends B) and B and C implemented a toString then calling toString on an instance of A would result in an infinite loop. With the updated code, an array is built to represent the prototype chain, and that array is traversed IN REVERSE until it finds the calling function. Then it grabs the NEXT prototype in the chain and executes the method if it exists. No need to search and keep digging throught the chain to see where it is implemented…because the built in chain traversal will do that for us (pretty much the same reason the bug was occurring).
Anyway code is fixed and re-posted.
