Source code in the clojure programming language

(if (= 1 1) :yes :no) ; returns :yes

(if (= 1 2) :yes :no) ; returns :no

(if (= 1 2) :yes) ; returns nil


(when x
  (print "hello")
  (println " world")
  5) ; when x is logical true, prints "hello world" and returns 5; otherwise does nothing, returns nil


(cond
  (= 1 2) :no) ; returns nil

(cond
  (= 1 2) :no
  (= 1 1) :yes) ; returns :yes


(cond
  (= 1 2) :no
  :else :yes) ; returns :yes


(condp < 3
  4 :a  ; cond equivalent would be (< 4 3) :a
  3 :b
  2 :c
  1 :d) ; returns :c


(condp < 3
  4 :a
  3 :b
  :no-match) ; returns :no-match


(case 2
  0 (println "0")
  1 (println "1")
  2 (println "2")) ; prints 2.