Union Type

Union Type은 JS에서 AND 연산자와 OR 연산자를 생각하면 이해하기 쉽습니다.

function logText(text : string | number) {
    //...
}

function getBirth(birth : number | string) {
    if (typeof birth === 'number') {
        return birth + '년';
    } 
    if (typeof birth === 'string') {
        return birth;
    }
    return new TypeError('age muse be number of string');
}

Intersection Type

interface Person {
    name: string;
    age: number;
}
interface Developer {
    name: string;
    skill: number;
}
type Capt = Person & Developer;