So far, we have looked at three loops: the for...in loop, the while loop, and the repeat-while loop. We will use the for...in loop again, but first, we need to talk about collections.

In the next chapter, we will focus on what collections are and how to use them when working with data. Make sure that you fully understand loops, because we will build on them in the next chapter and throughout this book. Therefore, review as much as you need so that you feel confident that you are proficient in the topics contained in this chapter.