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Postconditions
Learn Postconditions in Clojure with a construct-specific explanation, a unique example, a practical boundary, and a mastery check.
Postconditions is an atomic Clojure topic inside Polymorphism, Errors & Testing. The example below uses the actual construct named by the lesson rather than a generic placeholder.
Focus on what Postconditions changes: the input, binding, control path, object state, collection, runtime effect, or language contract. Then alter one value and verify that the behavior changes for a reason specific to this feature.
Topic-specific example
(defn percent [x] {:post [(<= 0 % 100)]} (min 100 x))
(percent 72)
Change the key input in this Clojure example and predict the result first; the named construct should be the reason the behavior changes.