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select-keys
Learn select-keys in Clojure with a construct-specific explanation, a unique example, a practical boundary, and a mastery check.
select-keys is an atomic Clojure topic inside Collection Transformations. The example below uses the actual construct named by the lesson rather than a generic placeholder.
Focus on what select-keys 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
(select-keys {:id 7 :name "Nora" :token "x"} [:id :name])
Check the input collection shape, whether the operation mutates or returns a new value, and what happens for an empty collection.