interface 기본

// 1. class implements interfaceå 

interface IPerson {
    name: string;
    age?: number;
    hello(): void;
}

class Person implements IPerson {
    name: string;

    constructor(name: string) {
        this.name = name;
    }
    hello(): void {
        console.log(`안녕하세요. ${this.name}입니다.`);
    }
}

const person: IPerson = new Person('Hyun');
person.hello();


// 2. interface extends interface
interface IKorean extends IPerson {
    city: string;
}

const h: IKorean = {
    name: 'Hyun',
    city: 'Seoul',
    hello(): void {
        console.log(`Hi, my name is ${this.name} and I live in ${this.city}.`);
    }
}
h.hello();


// 3. function interface
interface HelloPerson {
    (name: string, age?: number): void;
}

const helloPerson: HelloPerson = (name: string) => {
    console.log(`Hi, my name is ${name}`);
}

helloPerson('Hyun');
helloPerson('Kim', 32);



// 4. readonly interface property
interface IPerson4 {
    name: string;
    age?: number;
    readonly gender: string;
}

const k: IPerson4 = {
    name: "Kim",
    gender: "Male"
}