Dissected original logic, tested private variables, fixed stardjs linting

js-jest/package.json

@@ -3,6 +3,7 @@
   "version": "1.0.0",
   "description": "Gilded Rose kata in JavaScript with Jest",
   "scripts": {
+    "start": "node ./test/texttest_fixture.js",
     "test": "jest",
     "test:watch": "jest --watch",
     "test:coverage": "jest --coverage"
@@ -25,13 +26,12 @@
   "devDependencies": {
     "babel-eslint": "^10.1.0",
     "jest": "^24.9.0",
-    "standard": "^5.0.0"
+    "standardx": "^5.0.0"
   },
-  "standard": {
+  "standardx": {
     "parser": "babel-eslint",
     "env": [
-      "jest",
-      "node"
+      "node", "jest"
     ],
     "ignore": [
       "node_modules"

js-jest/src/gilded_rose.js

@@ -18,15 +18,29 @@ class RegularItem extends Item {
     this.validateItemProps(itemProps)
   }
 
-  validateItemProps({ name, sellIn, quality }) {
-    const errors = [];
+  _privateVar = 0
+
+  get privateVar () {
+    return this._privateVar
+  }
+
+  set privateVar (value) {
+    console.log(`entered set privateVar with value: ${value}`)
+    this._privateVar = value
+  }
+
+  validateItemProps ({ name, sellIn, quality }) {
+    const errors = []
 
     const isNameValid = typeof name === 'string' && name.length
-    const isSellInValid = typeof sellIn === 'number' && sellIn > 0
-    const isQualityValid = typeof quality === 'number' && quality >= 0 && quality <=50
+    const isSellInValid = typeof sellIn === 'number'
+
+    // "The Quality of an item is never negative"
+    // "The Quality of an item is never more than 50"
+    const isQualityValid = typeof quality === 'number' && quality >= 0 && quality <= 50
 
     !isNameValid && errors.push('"name" must be a valid, non-empty string')
-    !isSellInValid && errors.push('"sellIn" must be an integer, greater than zero')
+    !isSellInValid && errors.push('"sellIn" must be an integer')
     !isQualityValid && errors.push('"qualityValid" must be an integer, between 0 and 50')
 
     if (errors.length) {
@@ -35,60 +49,50 @@ class RegularItem extends Item {
   }
 }
 
-class Blade extends Item {
-  constructor(...args) {
-    super(...args)
-  }
-
-  whatAmI() {
-    console.log(`[Blade] I am a Blade with: name: ${this.name}, sellIn: ${this.sellIn}, quality: ${this.quality}`)
-  }
-}
-
-class Sword extends Blade {
-  constructor(...args) {
-    super(...args)
-  }
-
-  whoAmI() {
-    console.log('[Sword] I am a sword! AND...')
-    this.whatAmI()
-  }
-}
-
 class Shop {
   constructor (items = []) {
     this.items = items
   }
 
   updateQuality () {
+    // Iterate list of items
     for (let i = 0; i < this.items.length; i++) {
+      // NOT cheese && NOT pass && quality > 0 && NOT sulfuras, therefore RegularItem
       if (this.items[i].name !== 'Aged Brie' && this.items[i].name !== 'Backstage passes to a TAFKAL80ETC concert') {
         if (this.items[i].quality > 0) {
           if (this.items[i].name !== 'Sulfuras, Hand of Ragnaros') {
+            // RegularItems decrement quality by 1
             this.items[i].quality = this.items[i].quality - 1
           }
         }
       } else {
         if (this.items[i].quality < 50) {
+          // Increment quality by 1 for all non RegularItems
           this.items[i].quality = this.items[i].quality + 1
+
           if (this.items[i].name === 'Backstage passes to a TAFKAL80ETC concert') {
             if (this.items[i].sellIn < 11) {
               if (this.items[i].quality < 50) {
                 this.items[i].quality = this.items[i].quality + 1
               }
+              // if sellIn is less than 11 for passes, net quality increase is 2
             }
             if (this.items[i].sellIn < 6) {
               if (this.items[i].quality < 50) {
                 this.items[i].quality = this.items[i].quality + 1
               }
+              // if sellIn is less than 6 for passes, net quality increase is 3
             }
           }
         }
       }
+
+      // Unnecessary decrement of sellIn
+      // "Sulfuras", being a legendary item, never has to be sold or decreases in Quality"
       if (this.items[i].name !== 'Sulfuras, Hand of Ragnaros') {
         this.items[i].sellIn = this.items[i].sellIn - 1
       }
+
       if (this.items[i].sellIn < 0) {
         if (this.items[i].name !== 'Aged Brie') {
           if (this.items[i].name !== 'Backstage passes to a TAFKAL80ETC concert') {
@@ -115,6 +119,5 @@ class Shop {
 module.exports = {
   Item,
   Shop,
-  Sword,
   RegularItem
 }

js-jest/test/gilded_rose.test.js

@@ -1,4 +1,4 @@
-const { Shop, Item, RegularItem } = require('../src/gilded_rose')
+const { RegularItem } = require('../src/gilded_rose')
 
 // describe('Gilded Rose', function () {
 //   it('should foo', function () {
@@ -21,11 +21,10 @@ describe('RegularItem', () => {
   })
 
   it('should throw an error if initialized with an invalid sellIn property', () => {
-    expect(getRegularItemFactory({ sellIn: -1 })).toThrow()
-    expect(getRegularItemFactory({ sellIn: 0 })).toThrow()
+    expect(getRegularItemFactory({ sellIn: '' })).toThrow()
   })
 
-  it('should throw an error if initialized with a quality property < 0 || > 50', () => {
+  it('should throw an error if initialized with a quality property < 0 OR > 50', () => {
     expect(getRegularItemFactory({ quality: -1 })).toThrow()
     expect(getRegularItemFactory({ quality: 51 })).toThrow()
   })

js-jest/test/texttest_fixture.js

@@ -1,5 +1,5 @@
 
-const { Shop, Item, Sword } = require('../src/gilded_rose')
+const { Shop, Item, RegularItem } = require('../src/gilded_rose')
 
 const items = [
   new Item('+5 Dexterity Vest', 10, 20),
@@ -15,8 +15,15 @@ const items = [
   new Item('Conjured Mana Cake', 3, 6)
 ]
 
-const mySword = new Sword('Awesome Sword', 10, 20)
-mySword.whoAmI()
+const mockRegularItem = new RegularItem({
+  name: 'Mock RegularItem',
+  sellIn: 5,
+  quality: 10
+})
+
+console.log('mockRegularItem.privateVar', mockRegularItem.privateVar) // bbarreto_debug
+mockRegularItem.privateVar = 10
+console.log('mockRegularItem.privateVar', mockRegularItem.privateVar) // bbarreto_debug
 
 const days = Number(process.argv[2]) || 2
 const gildedRose = new Shop(items)