Array Cardio 1. some const isAdult = people.some( (person) => new Date().getFullYear() - person.year >= 19 ); python 의 any랑 같은 메서드. 하나라도 true면 true 2. every const allAdults = people.every( (person) => new Date().getFullYear() - person.year >= 19 ); python의 all. 모두 true여야 true 3. find, findIndex const comment = comments.find((comment) => comment.id == 823423); const index = comments.findIndex((co..