Created
March 7, 2023 20:10
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(ns area3 | |
(:require | |
[clojure.math :as math] | |
[criterium.core :as crit])) | |
(set! *warn-on-reflection* true) | |
(set! *unchecked-math* false) | |
(definterface IArea2 | |
(^double area [])) | |
;(require '[clj-java-decompiler.core :refer [decompile]]) | |
(defrecord Square [^double side] | |
IArea2 | |
(area [this] | |
(Math/pow side (double 2)))) | |
(defrecord Rectangle [^double width ^double height] | |
IArea2 | |
(area [_] | |
(* width height))) | |
(defrecord Triangle [^double base ^double height] | |
IArea2 | |
(area [_] | |
(* 0.5 base height))) | |
(defrecord Circle [^double radius] | |
IArea2 | |
(area [this] | |
(* math/PI (Math/pow radius (double 2))))) | |
(defn make-random-shape [] | |
(let [shapes [:square :rectangle :circle :triangle] | |
shape (rand-nth shapes)] | |
(case shape | |
:square (->Square (rand-int 10)) | |
:rectangle (->Rectangle (rand-int 10) (rand-int 10)) | |
:triangle (->Triangle (rand-int 10) (rand-int 10)) | |
:circle (->Circle (rand-int 10))))) | |
(defn total-area [shapes] | |
(loop [n (double 0) | |
[^IArea2 s & r] shapes] | |
(if s | |
(recur (+ n (.area s)) r) | |
n))) | |
(def lots-of-shapes (doall (repeatedly 400000 #(make-random-shape)))) | |
(crit/quick-bench (total-area lots-of-shapes)) |
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