hadielmougy

;; fixed version of 'state' at http://mishadoff.com/blog/clojure-design-patterns/#episode-3-state
;; takeaway: if you call 'swap!' twice on the same atom, you are probably making a mistake

(def user {:name "Jackie Brown"
           :balance 0
           :subscription? false})
				 
(def ^:const SUBSCRIPTION_COST 30)

(defn pay

hadielmougy

(ns powerset.core-test
  (:use (clojure set test)))

(defn powerset [s]
  (apply union
         #{s} ;the complete set of all s
         (map (fn [i] (powerset (disj s i))) s)))

(deftest test-powerset
  (is (= #{#{}}