Yoko Oh Noes confused about hoisting and loops

See the demo program at https://www.khanacademy.org/computer-programming/confused/5208304615768064 . It attempts to initialize a variable declared inside the body of a loop to **undefined** causing the complaint "It's not necessary to initialize 't' to 'undefined'." which is certainly not the case.

Open the linked Khan Academy demo first and reproduce the warning about initializing 't' to 'undefined'. Then locate the live editor diagnostic that reports this message and determine why the loop-scoped declaration is treated as unnecessary; done means the valid example no longer produces the complaint.

Written by the indexing model from the issue text.