function solution(numbers) {
let cpr=0;
let sum = numbers.reduce((a,b) => a+b, 0);
for (let i=0; i<=9; i++) cpr+=i;
return cpr-sum;
}
console.log(solution([1, 2, 3, 4, 6, 7, 8, 0]));
function solution(numbers) {
let answer = 0;
for(let i = 0; i <= 9; i++) {
if(!numbers.includes(i)) answer += i;
}
return answer;
}