In racket: (for/list ([i (in-range 10) #:when (zero? (remainder i 3))]) (pow i 2)) there’s also for/vector for/and for/or for/first

In racket: (for/list ([i (in-range 10) #:when (zero? (remainder i 3))]) (pow i 2)) there’s also for/vector for/and for/or for/first for/last, most likely for/set. Hashes. can add your own, etc…