Returns true if argument is a function or a symbol that resolves to
a function (not a macro).
Source
clojure/test.clj:403
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(defn function?
"Returns true if argument is a function or a symbol that resolves to
a function (not a macro)."
{:added "1.1"}
[x]
(if (symbol? x)
(when-let [v (resolve x)]
(when-let [value (get-possibly-unbound-var v)]
(and (fn? value)
(not (:macro (meta v))))))
(fn? x)))
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