实现装饰器模式示例，添加相关类和方法，增强代码可读性

go/decorator/main.go

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+package main
+
+import "fmt"
+
+/*
+实例
+汤宝宝家有一台咖啡机，他会自动给美式咖啡加奶和糖...
+*/
+
+type Drink interface {
+	GetPrice() float64
+	cost()
+}
+
+type Coffee struct {
+	name  string
+	Price float64
+}
+
+func (c *Coffee) GetPrice() float64 {
+	return c.Price
+}
+
+func (c *Coffee) cost() {
+	fmt.Printf("一杯%s咖啡，价格%.2f元。\n", c.name, c.Price)
+}
+
+type Maker struct {
+	wrappedDrink Drink
+	milkPrice    float64
+	sugarPrice   float64
+}
+
+func (m *Maker) GetPrice() float64 {
+	return m.wrappedDrink.GetPrice()
+}
+
+func (m *Maker) cost() {
+	m.wrappedDrink.cost()
+	fmt.Printf("加了奶和糖，总价%.2f元。\n",
+		m.wrappedDrink.GetPrice()+m.milkPrice+m.sugarPrice)
+}
+
+func main() {
+	fmt.Println("============= 装饰器模式 =============")
+
+	var coffee, newCoffee Drink
+
+	fmt.Println("自己泡杯咖啡")
+	coffee = &Coffee{
+		name:  "美式",
+		Price: 10.0,
+	}
+	coffee.cost()
+
+	fmt.Println("\n用咖啡机泡杯咖啡")
+	newCoffee = &Maker{
+		wrappedDrink: coffee,
+		milkPrice:    1.0,
+		sugarPrice:   1.0,
+	}
+	newCoffee.cost()
+
+	fmt.Println()
+	fmt.Println("=========== 装饰器模式结束 ===========")
+}

python/decorator/main.py

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+"""
+实例
+汤宝宝家有一台咖啡机，他会自动给美式咖啡加奶和糖...
+"""
+
+from abc import ABC, abstractmethod
+
+
+class Drink(ABC):
+    price: float
+    name: str
+
+    @abstractmethod
+    def cost(self) -> None:
+        pass
+
+
+class Coffee(Drink):
+    def __init__(self, name: str, price: float) -> None:
+        self.name = name
+        self.price = price
+
+    def cost(self) -> None:
+        print(f"一杯{self.name}咖啡，价格{self.price:.2f}元")
+
+
+class Maker:
+    def __init__(self, drink: Drink, milk_price: float, sugar_price: float) -> None:
+        self.drink = drink
+        self.milk_price = milk_price
+        self.sugar_price = sugar_price
+
+    def cost(self) -> None:
+        self.drink.cost()
+        print(
+            f"加了奶和糖，总价{self.drink.price + self.milk_price + self.sugar_price:.2f}元。"
+        )
+
+
+if __name__ == "__main__":
+    print("============= 装饰器模式 =============")
+    print("自己泡杯咖啡")
+    coffee = Coffee("美式", 10.0)
+    coffee.cost()
+    print("\n用咖啡机泡杯咖啡")
+    new_coffee = Maker(coffee, milk_price=1.0, sugar_price=1.0)
+    new_coffee.cost()
+    print("\n=========== 装饰器模式结束 ===========")

ts/src/decorator/index.ts

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+/*
+实例
+汤宝宝家有一台咖啡机，他会自动给美式咖啡加奶和糖...
+*/
+
+interface Drink {
+    price: number;
+    name: string;
+    cost(): void;
+}
+
+class Coffee implements Drink {
+    price: number;
+    name: string;
+    constructor(name: string, price: number) {
+        this.name = name;
+        this.price = price;
+    }
+    cost() {
+        console.log(`一杯${this.name}咖啡，价格${this.price.toFixed(2)}元`);
+    }
+}
+
+class Maker {
+    drink: Drink;
+    milkPrice: number;
+    sugarPrice: number;
+    constructor(drink: Drink, milkPrice: number, sugarPrice: number) {
+        this.drink = drink;
+        this.milkPrice = milkPrice;
+        this.sugarPrice = sugarPrice;
+    }
+    cost() {
+        this.drink.cost();
+        const total = this.drink.price + this.milkPrice + this.sugarPrice;
+        console.log(`加奶加糖后，总价${total.toFixed(2)}元`);
+    }
+}
+
+(function(){
+    console.log("============= 装饰器模式 =============");
+
+    console.log("自己泡杯咖啡")
+    const coffee = new Coffee('美式', 10);
+    coffee.cost();
+    console.log("\n用咖啡机泡杯咖啡")
+    const maker = new Maker(coffee, 1, 1);
+    maker.cost();
+    console.log("\n=========== 装饰器模式结束 ===========");
+})()