store/[org.clojure/clojure "1.8.0"] clj::clojure.core/future?

Official Documentation

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Arities
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Docstring
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  Returns true if x is a future

Source

(defn future?
  "Returns true if x is a future"
  {:added "1.1"
   :static true}
  [x] (instance? java.util.concurrent.Future x))

Example 1

Edit
(def f (future (inc 0)))
;; => #'user/f

(future? f)
;; => true

(future? 1)
;; => false

;; deref gets the value (result) of a future
(deref f)
;; => 1

;; the @ reader macro expands to deref
@f
;; => 1

Uses on crossclj