If they're new enough to not understand that map, et al are using loops internally, then they're probably too new to be working an actual job. They might never

If they're new enough to not understand that map, et al are using loops internally, then they're probably too new to be working an actual job. They might never have been exposed to it, in which case an explanation is warranted, but if they still don't get it, maybe they're not cut out to be a programmer.