Implementation of Nock in Racket
Direct usage of the functions should be fairly obvious, and the included test cases provide examples. If you just want to use nock function, then there is a macro so that you can say something like (nock-eval [42 [1 10 20 30]]), and the result will be '(10 20 . 30).
For reference regarding Nock, see Crash Course in Nock.