[자바스크립트] constructor

class Animal { constructor(type, name, sound) { this.type = type; this.name = name; this.sound = sound; } say() { console.log(this.sound); } } const dog = new Animal("개", "멍멍이", "멍멍"); const cat = new Animal("고양이", "야옹이", "야옹"); dog.say(); cat.say(); ------------------------------------------------------------------------ extended class Animal { constructor(type, name, sound) { this.type = type; this.name = name; this.sound = sound; } say() { console.log(this.sound); } } class Dog extends Animal { constructor(name, sound) {} } const dog = new Animal("개", "멍멍이", "멍멍"); const cat = new Animal("고양이", "야옹이", "야옹"); const cat2 = new Animal("야옹이", "야옹야옹이", "야야옹"); dog.say(); cat.say(); cat2.say(); --------------------------------------------------------------- super 추가 class Animal { constructor(type, name, sound) { this.type = type; this.name = name; this.sound = sound; } say() { console.log(this.sound); } } class Dog extends Animal { constructor(name, sound) { super("개", name, sound); } } class Cat extends Animal { constructor(name, sound) { super("고양이", name, sound); } } const dog = new Dog("멍멍이", "멍멍"); const cat = new Cat("고양이", "야옹"); const cat2 = new Cat("야옹야옹이", "야야옹"); dog.say(); cat.say(); cat2.say(); ------------------------------------------------------------- constructor class Food { constructor(name) { this.name = name; this.brands = []; } addBrand(brand) { this.brands.push(brand) } print() { console.log(`${this.name}을 파는 음식점들:`); console.log(this.brands.join(",")); } } const pizza = new Food("피자"); pizza.addBrand("피자헛"); pizza.addBrand("도미노"); const chicken = new Food("치킨"); chicken.addBrand("굽네"); chicken.addBrand("BBQ"); pizza.print(); chicken.print();