keyword?

function/macrosince v0.0-927 clojure.core/keyword?Edit
(keyword? x)

Source docstring:
Return true if x is a Keyword
Function code @ clojurescript:src/main/cljs/cljs/core.cljs
(defn keyword?
  [x]
  (instance? Keyword x))

Macro code @ clojurescript:src/main/clojure/cljs/core.cljc
(core/defmacro keyword? [x]
  (bool-expr `(instance? Keyword ~x)))