Mr. Lee's U2L5 Day 1 Do Now

The shopping list is reset to an empty list every time the sprite is clicked, then an item is added to it. So "shopping list" will ever only contain the last item added to it.

The list "shopping list" will never get updated. list(shopping list) creates a new one-item list in which the only item is itself a list (the full shopping list). But that list is never stored anywhere, in a variable, so it disappears as soon as that instruction finishes.

This is a rare run-time error in Snap. Like what it sounds like, it happens while the program is running. Run-time errors stop the program from continuing (crashing the app). Explain on the next slide what the bug is.

Append: (v.) “Add” to the end

● Append “juice” to “orange”: “orangejuice”

● Append “5” to “10”: “105”

● Append 5 to [10] (a list containing number 10): [10, 5]

● Append “juice” to [“beet”, “root”]: [“beet”, “root”, “juice”]