Every for-range loop is noise, a missed opportunity to take what you're doing and factor it out to something reusable (filter, map, flatMap, groupBy, join, what

Every for-range loop is noise, a missed opportunity to take what you're doing and factor it out to something reusable (filter, map, flatMap, groupBy, join, whatever) that nobody should have to read more than once per project (or ideally, ever). There's no beauty to be found in repeating yourself when the computer is much better at that.