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  1. (def atom?
  2.   (fn [a]
  3.     (not (seq? a))))
  4.  
  5. (def null?
  6.   (fn [a]
  7.     (or
  8.       (nil? a)
  9.       (= () a))))
  10.  
  11. (def lat?
  12.   (fn [l] 
  13.     (cond
  14.       (null? l) true 
  15.       (and (seq? l)
  16.            (atom? (first l)))
  17.              (lat? (rest l))
  18.       true false)))
  19.  
  20. (println (lat? '(a b c)))
  21. (println (lat? 'a))
  22.  
  23.  
  24. (def member?
  25.   (fn [a lat]
  26.     (cond
  27.       (null? lat) false
  28.       true (or
  29.         (= (first lat) a)
  30.         (member? a (rest lat)))) ))
  31.  
  32. (println (member? 'a '(a b c)))
  33. (println (member? 'd '(a b c)))
  34.  
  35.  
  36.  
  37.  
Success #stdin #stdout 1.18s 220224KB
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true
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https://ideone.com/y3lYz
language:
Clojure (clojure 1.10.0)
created:
11 years ago
visibility:
public

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