(def does-maths-work1 (if (not (= (+ 2 2) 4)) "UH OH" "Maths works!"))

(def does-maths-work2 (if-not (= (+ 2 2) 4) "UH OH" "Maths works!"))

(println does-maths-work1)
(println does-maths-work2)

(if (= (+ 2 2) 4) (do (println "Maths works!") (println "Hooray!")))

(when (= (+ 2 2) 4) (println "Maths works!") (println "Hooray!"))