μ΄ν°λ¬λΈκ³Ό μ΄ν°λ μ΄ν°
[Symbol.iterator]
μ μ¬λ°°μ΄, μ΄ν°λ¬λΈ, λ°°μ΄
ref : https://inpa.tistory.com/entry/JS-π-μ΄ν°λ¬λΈ-μ΄ν°λ μ΄ν°-π―μλ²½-μ΄ν΄
ref: https://yceffort.kr/2021/02/javascript-array-and-iterable