I have downloaded the AP Computer Science Principles with Swift book, to possibly utilize the curriculum in order to teach that class. I am relatively new to Swift and Xcode but interested in learning more about it. When I open the PlaygroundBasics.playground file, I see the introduction page and I also see a blue dot. However, I do not see any animation to it (seemingly supposed to go through different colors/position for the animation).
I am upgraded to Xcode 10.2.1 using Mojave.
