My curiosity got the better of me:
(require '[clojure.spec.alpha :as spec]
'[clojure.test :refer [is with-test]])
(spec/fdef local-bindings
:args (spec/cat :closure fn?)
:ret (spec/map-of simple-keyword? any?))
(with-test
(defn local-bindings [closure]
(into {}
(map (fn [^java.lang.reflect.Field field]
[(keyword (.getName field))
(do
(.setAccessible field true) ; The closed-over locals
are not public.
(.get field closure))]))
(.getDeclaredFields (class closure))))
(is (= {:x 3} (local-bindings (constantly 3))))
(is (= {} (local-bindings constantly)))
(is (= {:f first
:g second} (local-bindings (juxt first second)))))
I would *not* rely on this code, though. It definitely feels like a hack.
On Thursday, May 24, 2018 at 2:22:42 PM UTC-4, Sonny To wrote:
>
> (defn foo[]
> (let [x 1]
> (fn []
> (+ x 1)
> )
> )
>
> (def bar (foo))
>
> Is there a way to get the value of x from closure bar?
>
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