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number
변수에 초기로 정수가 할당되고, 이후 문자열이 할당되어 타입 불일치 발생할 수 있습니다.let array = [1, 2, 3]
에서array[3]
를 참조할 때 index 초과로 인한 런타임 오류 발생 가능성 있음.