Scratch lists are not first class. You can only create them as variables; you can't create list "values" (there are no list literals) and you can't pass lists a

Scratch lists are not first class. You can only create them as variables; you can't create list "values" (there are no list literals) and you can't pass lists around. You can only provide lists as arguments by choosing list variables from a dropdown of certain built-in blocks.