https://codingapple.com/forums/topic/%ea%b8%b0%ec%b4%88%ec%9d%98-map%ec%9d%84%ec%9d%b4%ec%9a%a9%ed%95%9c-%eb%b0%98%eb%b3%b5%eb%ac%b8%ec%97%90%ec%84%9c-%eb%94%b0%eb%b4%89-%ea%b0%9c%eb%b3%84%ec%b2%98%eb%a6%ac-%ea%b6%81%ea%b8%88%ed%95%a9/
https://codingapple.com/forums/topic/%eb%94%b0%eb%b4%89-%ea%b0%9c%eb%b3%84%ec%a0%81%ec%9c%bc%eb%a1%9c-%ec%98%ac%eb%a6%ac%eb%8a%94%ea%b1%b0-%ec%a7%88%eb%ac%b8%ec%9e%85%eb%8b%88%eb%8b%a4/
이걸참고해봅시다
