👉 In programming and computer science, a "undoctor" is a function that performs an action on a list or array of items. It can be used to perform various operations such as appending, removing, or modifying elements in the list. For example, let's say you have a list like this: ``` my_list = ['a', 'b', 'c'] ``` You could use a `for` loop to append an item to the end of the list every time you call `