diff --git a/TypeScript/app/gilded-rose.ts b/TypeScript/app/gilded-rose.ts
index 1023c876..745dab87 100644
--- a/TypeScript/app/gilded-rose.ts
+++ b/TypeScript/app/gilded-rose.ts
@@ -18,14 +18,19 @@ export class GildedRose {
   }
 
   updateQuality() {
-    this.items = this.items
-      .map((item) => ({ ...item, quality: updateItemQuality(item) }))
-      .map((item) => ({ ...item, sellIn: updateItemSellIn(item) }))
-      .map(item => ({ ...item, quality: sellInBelow0(item) }))
+    this.items = updateItems(this.items)
     return this.items;
   }
 }
 
+
+function updateItems(items: Item[]): Item[] {
+  return items 
+    .map((item) => ({ ...item, quality: updateItemQuality(item) }))
+    .map((item) => ({ ...item, sellIn: updateItemSellIn(item) }))
+    .map(item => ({ ...item, quality: sellInBelow0(item) }))
+}
+
 function updateItemSellIn({name, sellIn}: Item) {
   if (name == 'Sulfuras, Hand of Ragnaros') return sellIn