finished performance_monitor exercise

Author: strychemi

06_performance_monitor/performance_monitor.rb

@@ -0,0 +1,12 @@
+def measure(n = 1)
+  dt = 0
+  n.times do
+    t1 = Time.now
+    #puts t1
+    yield
+    t2 = Time.now
+    #puts t2
+    dt += t2 - t1
+  end
+  dt /= n
+end