e briefly talked about dynamic memory and how the garbage collector frees memory which no longer has any valid references.

Can you think of any other ways you might handle freeing memory? What if the system ran out of memory and you had to delete something. How might you go about deciding what to delete?

In your response, also consider the costs associated with a more intricate policy $($e$.$g$.$ more frequent deletes or keeping track of recently used variables$).$ Are these costs worth it$?$