Here are some questions that might be on your mind:

Q) What's the difference between pointers and references?

A) Pointers are like references with boosters. Pointers can be changed to point to different variables (memory addresses), as well as point to dynamically allocated memory on the free store.

Q) What's the deal with arrays and pointers?

A) Arrays are really constant pointers to their first element.

Q) Can you remind me about the new keyword and memory leaks?

A) When we use memory on the free store using the new keyword, it persists even when the function it was created in has returned and all the local variables are gone. When we are done with using memory on the free store we must release it. So if we use memory on the free store, that we want to persist, beyond the life of a function, we must make sure to keep a pointer to it or we will have leaked memory. It would be like putting all our belongings in our house and then forgetting where we live! When we return the zombies array from createHorde, it is like passing the relay baton (memory address) from createHorde to main. It's like saying OK, here is your horde of zombies - they are your responsibility now. We wouldn't want any leaked zombies running around in our RAM so we must remember to call delete on pointers to dynamically allocated memory.