diff --git a/TypeScript/src/gilded-rose.ts b/TypeScript/src/gilded-rose.ts
index d0bb1868..1c3f0e0f 100644
--- a/TypeScript/src/gilded-rose.ts
+++ b/TypeScript/src/gilded-rose.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
 export class Item {
   name: string
   sellIn: number
@@ -20,19 +21,30 @@ export class GildedRose {
     this.items = items
   }
 
+  // est périmité ?
+  // should increase quality ?
+
+  shouldDecreaseQuality(item: Item) {
+    return (
+      item.name != 'Aged Brie' &&
+      item.name != 'Backstage passes to a TAFKAL80ETC concert' &&
+      item.quality > 0
+    )
+  }
+
+  isLegendayProduct(item: Item) {
+    return item.name === 'Sulfuras, Hand of Ragnaros'
+  }
+
   updateQuality() {
     this.items.forEach(item => {
+      if (this.isLegendayProduct(item)) {
+        return
+      }
       const currentProductName = item.name
       // PART 1
-      if (
-        currentProductName != 'Aged Brie' &&
-        currentProductName != 'Backstage passes to a TAFKAL80ETC concert'
-      ) {
-        if (item.quality > 0) {
-          if (currentProductName != 'Sulfuras, Hand of Ragnaros') {
-            item.quality = item.quality - 1
-          }
-        }
+      if (this.shouldDecreaseQuality(item)) {
+        item.quality = item.quality - 1
       } else {
         if (item.quality < 50) {
           item.quality = item.quality + 1
@@ -51,17 +63,13 @@ export class GildedRose {
         }
       }
       // part 2
-      if (currentProductName != 'Sulfuras, Hand of Ragnaros') {
-        item.sellIn = item.sellIn - 1
-      }
+      item.sellIn = item.sellIn - 1
       // part 3
       if (item.sellIn < 0) {
         if (currentProductName != 'Aged Brie') {
           if (currentProductName != 'Backstage passes to a TAFKAL80ETC concert') {
             if (item.quality > 0) {
-              if (currentProductName != 'Sulfuras, Hand of Ragnaros') {
-                item.quality = item.quality - 1
-              }
+              item.quality = item.quality - 1
             }
           } else {
             item.quality = item.quality - item.quality