add performance

TypeScript/app/gilded-rose.ts

@@ -67,3 +67,17 @@ export class GildedRose {
     return this.items;
   }
 }
+
+const startTime = performance.now();
+
+// Call the function
+const gildedRose = new GildedRose([]);
+gildedRose.updateQuality();
+
+// Record end time
+const endTime = performance.now();
+
+// Calculate the time difference
+const timeTaken = endTime - startTime;
+
+console.log(`myFunction took ${timeTaken.toFixed(2)} ms to execute.`);