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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Send-an-unknown-method-call/Clojure/send-an-unknown-method-call.clj Normal file
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(import '[java.util Date])
(import '[clojure.lang Reflector])
(def date1 (Date.))
(def date2 (Date.))
(def method "equals")
;; Two ways of invoking method "equals" on object date1
;; using date2 as argument
;; Way 1 - Using Reflector class
;; NOTE: The argument date2 is passed inside an array
(Reflector/invokeMethod date1 method (object-array [date2]))
;; Way 2 - Using eval
;; Eval runs any piece of valid Clojure code
;; So first we construct a piece of code to do what we want (where method name is inserted dynamically),
;; then we run the code using eval
(eval `(. date1 ~(symbol method) date2))