프의 장점은 루프의 제어부가 첫 번째 행에 모여 있어서 일목요연하게 파악할 수 있다는 겁니
다. 또한,
for
루프에서는
let
으로 초기화한 변수가
for
루프 안에서만 유효하다는 장점도 있
습니다(
7
장에서 더 설명합니다). 이런
for
문을
while
문으로 바꾸면, 컨트롤 변수는 루프 바
깥에서도 볼
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