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Jun 24th, 2018
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  1. (def vowel? (set "aeiou"))
  2.  
  3. (vowel? (first "abc")) ; => true
  4. (vowel? (first "cba")) ; => false
  5.  
  6. user=> (def ob {:foo "bar", :bar :baz, :qwerty 42})
  7. #'user/ob
  8. user=> (ob :foo)
  9. "bar"
  10.  
  11. user=> (:bar ob)
  12. :baz
  13.  
  14. user=> (def vowel-keywords (set [:a :e :i :o :u]))
  15. #'user/vowel-keywords
  16. user=> (:a vowel-keywords)
  17. :a
  18. user=> (:b vowel-keywords)
  19. nil
  20.  
  21. (vowel? (first "abc")) ; => "a"
  22. (vowel? (first "cba")) ; => nil
  23.  
  24. (if (vowel? (first "abc"))
  25. (println "yay")
  26. (println "oops")) ; => "yay"
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