charAt ()

charAt()

//첫글자 출력
//"문자열",charAt(숫자);

const str1 = "javascript reference";
const currentStr1 = str1.charAt();        //j
const currentStr2 = str1.charAt("0");     //j
const currentStr3 = str1.charAt("1");     //a
const currentStr4 = str1.charAt("2");     //v