#47
Contain Yourself
 

Difficulty:Easy
Topics:


The contains? function checks if a KEY is present in a given collection. This often leads beginner clojurians to use it incorrectly with numerically indexed collections like vectors and lists.
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(contains? #{4 5 6} __)
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(contains? [1 1 1 1 1] __)
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(contains? {4 :a 2 :b} __)
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(not (contains? '(1 2 4) __))


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