You often see loops that are doing two different things at once just because they can do that with one pass through a loop. But if you’re doing two different things in the same loop, then whenever you need to modify the loop you have to understand both things. By splitting the loop, you ensure you only need to understand the behavior you need to modify. Splitting a loop can also make it easier to use. A loop that calculates a single value can just return that value. Loops that do many things need to return structures or populate local variables.
