원시타입 (Primitive)

passed by value가 일어나는 5가지 데이터 타입(Boolean, Null, undefined, string, number)

출처

https://velog.io/@jakeseo_me/2019-04-01-1904-%EC%9E%91%EC%84%B1%EB%90%A8-2bjty7tuuf#%EC%9E%90%EB%B0%94%EC%8A%A4%ED%81%AC%EB%A6%BD%ED%8A%B8%EC%97%90%EC%84%9C-%EA%B0%92value%EA%B3%BC-%EC%B0%B8%EC%A1%B0reference