없는 숫자 더하기

function solution(numbers) {
    let compare = [0,1,2,3,4,5,6,7,8,9]
    let sum=0;
     for(let i=0; i<compare.length; i++ ){
         if(!(numbers.includes(compare[i]))){
             sum = sum + compare[i]
         }
     }
    return sum
}

다른사람 풀이

function solution(numbers) {
    return 45 - numbers.reduce((cur, acc) => cur + acc, 0);
}

쩐당...흡수흡수!!