PropTypes ์๋ฌ ํด๊ฒฐ
React์์ map() ๋ฉ์๋๋ฅผ ์ฌ์ฉํ ๋Warning: Each child in a list should have a unique "key" prop์ด๋ฌํ ์๋ฌ๊ฐ ๋ฐ์ํ๋ ๊ฒฝ์ฐ๊ฐ ์์ต๋๋ค.