CoordinateSystem = {
    CARTESIAN:0,
    POLAR:1
};

class Point {
    constructor(x, y) {
        this.x = x;
        this.y = y;
    }

    static get factory() {
        return new PointFactory();
    }
}

class Point {
    constructor(x, y) {
        this.x = x;
        this.y = y;
    }
    static get factory() {
        return new PointFactory();
    }
}
class PointFactory {
    static newCartesianPoint(x, y) {
        return new Point(x, y);
    }

    static newPolarPoint(rho, theta) {
        return new Point(rho * Math.cos(theta), rho * Math.sin(theta));
    }
}
const point = PointFactory.newPolarPoint(5, Math.PI / 2);
const point2 = PointFactory.newCartesianPoint(5, 6);
console.log(point);
console.log(point2);

class Drink {
    consume() {}
}
class Tea extends Drink {
    consume() {
        console.log("This is tea");
    }
}
class Coffee extends Drink {
    consume() {
        console.log("This is coffee");
    }
}
class DrinkFactory {
    prepare(amount) {}
}
class TeaFactory extends DrinkFactory {
    makeTea() {
        console.log("Tea Created");
        return new Tea();
    }
}
class CoffeeFactory extends DrinkFactory {
    makeCoffee() {
        console.log("Coffee Created");
        return new Coffee();
    }
}
const teaDrinkFactory = new TeaFactory();
const tea = teaDrinkFactory.makeTea();
tea.consume();
const coffeeDrinkFactory = new CoffeeFactory();
const coffee = coffeeDrinkFactory.makeCoffee();
coffee.consume();

class Person {
    constructor() {
        this.streetAddress = this.postcode = this.city = "";
        this.companyName = this.position = "";
        this.annualIncome = 0;
    }

    toString() {
        return `個(gè)人生活在 ${this.streetAddress}，${this.city}，${this.postcode} ，工作在 ${this.companyName} 作為一名 ${this.position} 收入 ${this.annualIncome}`;
    }
}

class PersonBuilder {
    constructor(person = new Person()) {
        this.person = person;
    }

    get lives() {
        return new PersonAddressBuilder(this.person);
    }

    get works() {
        return new PersonJobBuilder(this.person);
    }
    build() {
        return this.person;
    }
}
class PersonJobBuilder extends PersonBuilder {
    constructor(person) {
        super(person);
    }
    at(companyName) {
        this.person.companyName = companyName;
        return this;
    }
    asA(position) {
        this.person.position = position;
        return this;
    }
    earning(annualIncome) {
        this.person.annualIncome = annualIncome;
        return this;
    }
}

class PersonAddressBuilder extends PersonBuilder {
    constructor(person) {
        super(person);
    }

    at(streetAddress) {
        this.person.streetAddress = streetAddress;
        return this;
    }

    withPostcode(postcode) {
        this.person.postcode = postcode;
        return this;
    }

    in(city) {
        this.person.city = city;
        return this;
    }
}

const personBuilder = new PersonBuilder();
const person = personBuilder.lives
    .at("高新南九道")
    .in("深圳")
    .withPostcode("518029")
    .works.at("字節(jié)跳動(dòng)")
    .asA("工程師")
    .earning(10000)
    .build();
console.log(person.toString()); // 個(gè)人生活在 高新南九道，深圳，518029 ，工作在 字節(jié)跳動(dòng) 作為一名 工程師 收入 10000

class Car {
    constructor(name, model) {
        this.name = name;
        this.model = model;
    }
    setName(name) {
        console.log(name);
        this.name = name;
    }
    clone() {
        return new Car(this.name, this.model);
    }
}
const car = new Car();
car.setName("閃電");

const car2 = car.clone();
car2.setName("麥昆");

class Singleton {
    constructor() {
        const instance = this.constructor.instance;
        if (instance) {
            return instance;
        }
        this.constructor.instance = this;
    }

    say() {
        console.log("Saying……");
    }
}
const s1 = new Singleton();
const s2 = new Singleton();
console.log("Are they same?" + (s1 === s2));
s1.say();