jswrenn

$ curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.29.0/install.sh | bash
$ . ~/.nvm/nvm.sh
$ nvm install 0.10.32
$ nvm use 0.10.32
$ foreman run npm install --python=python2.7
$ foreman start

jswrenn

#lang racket

;;; Empty list base-case. Use as a basis for 'prepend'
(define (empty selector)
  (selector null null #t))

;;; Prepend : prepend given element to list. use 'empty' as basis
(define (prepend element list)
  (lambda (selector)
    (selector element list #f)))