In this badge you will learn about the types of problems that you can solve with loops and collections. How to do something with each item in a collection; how to find an item in a collection; how to simplify (reduce) collection to one item; how to filter items and only keep some of them; how to map (represent) each item into some other form; and many others.

TODO

As in each badge:

1. watch the three below videos while taking notes.
2. complete the programming notebook for this badge
3. write down in your mini-diary 3 things you learned and 1 you wish you understood better