Racket can use either. They are syntactically equivalent, but there are some community norms around when to use each. Racket’s included editor DrRacket takes th

Racket can use either. They are syntactically equivalent, but there are some community norms around when to use each. Racket’s included editor DrRacket takes the [ and ] keys and figures out which to use using those conventions, inserting either [ or ( as appropriate