Codility PerMissingElem Exercise Solution (JavaScript/NodeJS)

solution_codility_permmissingelem.js

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A) {
    // write your code in JavaScript (Node.js 8.9.4)
    A.sort(function (a,b) {
        return a - b
    })
    
    let result = 1
    let i = 0
    
    while (result === A[i]) {
        result++
        i++
    }
    return result
    
}

function solution(A) {

A.sort(function (a,b) {
    return a - b
})

let result = 1;

for (x in A){
    if(result === A[x]){
        result = A[x] + 1;
    }
}
return result

}