aphyr

:- use_module(library(pairs)).
:- use_module(library(reif)).

not_in_list(K, L) :-
  if_((L = []),
    true,
    ([X | More] = L,
     dif(K, X),
     not_in_list(K, More))).

jackfirth

Lessons in Using Continuations

This gist contains examples of how to build different kinds of control flow structures in Racket using macros and continuations. Examples include:

• Early exit from functions using a return statement.
• Early exit from arbitrary expressions using a simple exception system.
• Temporarily interrupting execution in order to check permissions.

lwhjp

#lang racket

;;
;; These are some examples of different ways to compute factorials
;; using various paradigms and features provided by Racket. There
;; are more options available in packages which are not imported
;; by default, but that rabbit hole goes very deep indeed.
;;
;; Comments and suggestions welcome!
;;    leo@lwh.jp