string.length

length 속성은 UTF-16 코드 유닛을 기준으로 문자열의 길이를 나타냅니다.

function solution(s) {
    var answer = '';

    let q = s.length;

    if (q%2 === 0){
        let half = q/2
        answer = s[half-1] + s[half]
    } else {
        let half = (q-1)/2
        answer = s[half]
    }

    return answer;
}

const str = 'Life, the universe and everything. Answer:';

console.log(`${str} ${str.length}`);
// expected output: "Life, the universe and everything. Answer: 42"

 

 

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https://developer.mozilla.org/ko/docs/Web/JavaScript/Reference/Global_Objects/String/length

String.length - JavaScript | MDN