The ‘operation’ is a function that takes an integer and returns an integer. But how can we provide that function to the body of another function? Easy in Swift, just like we provide arguments of any other type. Remember, functions are first-class citizens. Here is the complete function:
Every Friday at 2pm our team gathers around our large screen in our meeting room, people grab a snack, and the engineers show what they have done this week. This strengthens our faith in the product. We are in a race against time and competitors. Thus, we must show each other how much we can do in a week.