Added a new command (npm run test-performance) that shows that topiar…

…ist is currently ~25 times slower than using typeof and instanceof directly for the most common use case -- verifiying argument types.

package.json

@@ -26,7 +26,8 @@
 	},
 	"scripts": {
 		"test": "jasmine-node --verbose spec",
-		"saucelabs-test": "grunt saucelabs-test"
+		"saucelabs-test": "grunt saucelabs-test",
+		"test-performance": "node scripts/test-performance.js"
 	},
 	"bundledDependencies": [
 		"jasmine-standalone"

scripts/test-performance.js

@@ -0,0 +1,28 @@
+var topiarist = require('../lib/topiarist');
+
+function topiaristFunc(date, num) {
+  topiarist.isA(date, Date);
+  topiarist.isA(num, Number);
+}
+
+function manualFunc(date, num) {
+  if(!(date instanceof Date)) throw new Error('date must be of type Date');
+  if(typeof(num) != 'number') throw new Error('num must be a number');
+}
+
+function speedTest(funcName, func) {
+  var currentDate = new Date();
+  var startTime = Date.now();
+
+  for(var i = 0; i < 1000000; ++i) {
+    func(currentDate, i);
+  }
+
+  var endTime = Date.now();
+  console.log(funcName + ': ' + (endTime - startTime));
+}
+
+speedTest('topiarist', topiaristFunc);
+speedTest('manual', manualFunc);
+speedTest('topiarist', topiaristFunc);
+speedTest('manual', manualFunc);