(defn if-its [pred x]
(if (pred x) x))
=> (if-its even? 4)
4
=> (if-its even? 5)
nil
Or, if you want a macro for performance reasons or something, and don't
mind the loss of e.g. (filter identity (map (partial if-its pred) coll)):
(defmacro if-its [pred x]
`(let [a# ~x]
(if (~pred a#) a#)))
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