AlexManSPB · February 13, 2023 12:09 · Aug 30, 2019 · Aug 13, 2019 · Aug 12, 2019 · Aug 11, 2019
diff --git a/script.js → pattern-decorator.js b/script.js → pattern-decorator.js
diff --git a/script.js b/script.js
@@ -8,6 +8,11 @@
  */
 
 class interface_Coffee {
+  constructor() {
+        if (this.constructor.name === 'Creator') {
+            throw new Error(`${this.constructor.name}: can not create instance of interface`);
+        }
+    }
     getCost() {
         throw new Error(`Не описан метод getCost() в классе ${this.constructor.name}`);
     }

diff --git a/script.js b/script.js
@@ -20,10 +20,7 @@ class interface_Coffee {
 
 
 class StandartCoffee extends interface_Coffee {
-    constructor() {
-        super();
-        this.cost = 10;
-    }
+    cost = 10;
 
     getCost() {
         return this.cost

diff --git a/script.js b/script.js
@@ -7,73 +7,98 @@
  *
  */
 
-class StandartCoffee{
+class interface_Coffee {
+    getCost() {
+        throw new Error(`Не описан метод getCost() в классе ${this.constructor.name}`);
+    }
+
+    getDescription() {
+        throw new Error(`Не описан метод getDescription() в классе ${this.constructor.name}`);
+    }
+}
+
+
+
+class StandartCoffee extends interface_Coffee {
     constructor() {
-    this.cost = 10;
+        super();
+        this.cost = 10;
     }
+
     getCost() {
         return this.cost
     }
+
     getDescription() {
         return 'Standart coffee'
     }
 }
 
 
 
-
-class MilkCoffee {
+class MilkCoffee extends interface_Coffee {
     constructor(coffee) {
+        super();
         this.coffee = coffee
     }
+
     getCost() {
         return this.coffee.getCost() + 2
     }
+
     getDescription() {
         return this.coffee.getDescription() + ', milk'
     }
 }
 
-class WhipCoffee {
+class WhipCoffee extends interface_Coffee {
     constructor(coffee) {
+        super();
         this.coffee = coffee
     }
+
     getCost() {
         return this.coffee.getCost() + 5
     }
+
     getDescription() {
         return this.coffee.getDescription() + ', whip'
     }
 }
 
-class VanillaCoffee {
+class VanillaCoffee extends interface_Coffee {
     constructor(coffee) {
+        super();
         this.coffee = coffee
     }
+
     getCost() {
         return this.coffee.getCost() + 3
     }
+
     getDescription() {
         return this.coffee.getDescription() + ', vanilla'
     }
 }
 
-class DiscountCoffee {
+class DiscountCoffee extends interface_Coffee {
     constructor(coffee, percent) {
-        this.coffee = coffee
+        super();
+        this.coffee = coffee;
         this.percent = percent;
     }
-    getCost() {
-        return this.coffee.getCost() * ((100 - this.percent) / 100);
-    }
+
+    // намеренно провоцируем ошибку из интерфейса
+    // getCost() {
+    //     return this.coffee.getCost() * ((100 - this.percent) / 100);
+    // }
     getDescription() {
         return this.coffee.getDescription() + `, with discount ${this.percent}%`
     }
 }
 
 
 
-
 let someCoffee = new StandartCoffee()
 console.log(someCoffee.getCost())// 10
 console.log(someCoffee.getDescription())// Простой кофе

diff --git a/script.js b/script.js
@@ -0,0 +1,95 @@
+/**
+ *
+ * ПАТТЕРН ДЕКОРАТОР (обертка)
+ * Позволяет наделить обьект новыми возможностями не меняя первоначальный класс и не создавая дочерние классы
+ * Принцип работы: декоратор помещает целевой обьект в обьект обертку, кот-й запускает базовое поведение обьекта,
+ * а затем добавляет/отнимает что-то свое.
+ *
+ */
+
+class StandartCoffee{
+    constructor() {
+    this.cost = 10;
+    }
+    getCost() {
+        return this.cost
+    }
+    getDescription() {
+        return 'Standart coffee'
+    }
+}
+
+
+
+
+class MilkCoffee {
+    constructor(coffee) {
+        this.coffee = coffee
+    }
+    getCost() {
+        return this.coffee.getCost() + 2
+    }
+    getDescription() {
+        return this.coffee.getDescription() + ', milk'
+    }
+}
+
+class WhipCoffee {
+    constructor(coffee) {
+        this.coffee = coffee
+    }
+    getCost() {
+        return this.coffee.getCost() + 5
+    }
+    getDescription() {
+        return this.coffee.getDescription() + ', whip'
+    }
+}
+
+class VanillaCoffee {
+    constructor(coffee) {
+        this.coffee = coffee
+    }
+    getCost() {
+        return this.coffee.getCost() + 3
+    }
+    getDescription() {
+        return this.coffee.getDescription() + ', vanilla'
+    }
+}
+
+class DiscountCoffee {
+    constructor(coffee, percent) {
+        this.coffee = coffee
+        this.percent = percent;
+    }
+    getCost() {
+        return this.coffee.getCost() * ((100 - this.percent) / 100);
+    }
+    getDescription() {
+        return this.coffee.getDescription() + `, with discount ${this.percent}%`
+    }
+}
+
+
+
+
+let someCoffee = new StandartCoffee()
+console.log(someCoffee.getCost())// 10
+console.log(someCoffee.getDescription())// Простой кофе
+
+someCoffee = new MilkCoffee(someCoffee)
+console.log(someCoffee.getCost())// 12
+console.log(someCoffee.getDescription())// Простой кофе, молоко
+
+someCoffee = new WhipCoffee(someCoffee)
+console.log(someCoffee.getCost())// 17
+console.log(someCoffee.getDescription())// Простой кофе, молоко, сливки
+
+someCoffee = new VanillaCoffee(someCoffee)
+console.log(someCoffee.getCost())// 20
+console.log(someCoffee.getDescription())// Простой кофе, молоко, сливки, ваниль
+
+someCoffee = new DiscountCoffee(someCoffee, 20)
+console.log(someCoffee.getCost())// 16
+console.log(someCoffee.getDescription())// Простой кофе, молоко, сливки, ваниль, скидка 20%