Not sure on racket specifically if it does out of the box, but as a scheme(-like) language, this can be emulated via closures. Perhaps relatedly, as a scheme(-

Not sure on racket specifically if it does out of the box, but as a scheme(-like) language, this can be emulated via closures. Perhaps relatedly, as a scheme(-like), it is tail recursive, implying infnite recursion and can be used in a near-purely-functional way if desired.