Often we want to be able to have some code run repeatedly. Functions help us do some of these tasks, but sometimes we want to run it one after another in sequence. Maybe we want to add up the numbers from 1 to 10. Maybe we want to update the information of every user in our app. These tasks involve us running the same code repeatedly, often a set number of times. As always, we don't like it when code repeats itself. Loops allow us to do this without repetitive code.

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Finish Lesson 4 from the beginning up to Know When to Quit.

Try: Do the Lesson 4 Problem Set, at the end of the lesson. Only do problems 1, 2, 4, 7, 8.