allow the use of comment block - it could be as simple as this: (borrow from GP Blocks)
it’s just a no-op block you can put anywere
define function parameters like below so you can drag these into the code and you can be sure they’re local to the function and they do not refer to any other variable. you can still call the function the usual way.
(borrow from MIT App Inventor 2)
make a mapping function like below - such that you can apply a function to all elements of the list and result in a new list:
(borrow from MIT App Inventor 2)
etc