add benchmark function

desktop/sources/scripts/library.js

@@ -347,4 +347,11 @@ function Library (ronin) {
     }
     return a === b
   }
+
+  this.benchmark = async (fn) => { // logs time taken to execute a function
+    const start = Date.now()
+    const result = await fn()
+    console.log(`time taken: ${Date.now() - start}ms`)
+    return result
+  }
 }

examples/dejong.lisp

@@ -25,5 +25,11 @@
       (2 1)
     )
   )
-  (dejong 1280 1.6 -2.3 2.4 -2.1)
+  (benchmark (lambda ()
+    (dejong 12800 
+      (random -2 2)
+      (random -2 2)
+      (random -2 2)
+      (random -2 2) 
+  )))
 )