In Unit 5 Lesson 6 it states:
Up until now, the event-driven apps you have created responded to the user clicking an element or typing a number when you used
promptNum. What if we want the user to provide text instead of a number?
However I can not recall any time we have used promptNum during any of the earlier lessons. I may be wrong but if anyone can point me to where promptnum is first introduced that would be appreciated.