In for, in-range is faster. http://docs.racket-lang.org/reference/sequences.html?q=in-range#%28def._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._in-range%29%29

In for, in-range is faster. http://docs.racket-lang.org/reference/sequences.html?q=in-range#%28def._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._in-range%29%29 http://docs.racket-lang.org/reference/sequences.html?q=in-ra... An in-range application can provide better performance for number iteration when it appears directly in a for clause. -> (for ([i (in-range 1 16)]) (match (list (modulo i 3) (modulo i 5)) [(list 0 0) (displayln "fizzbuzz")] [(list 0 _) (displayln "fizz")] [(list _ 0) (displayln "buzz")] [_ (displayln i)]))