Find next non incremented number greater then 0

non-incremented-number.js

// find next non incremented number greater then 0

function solution(array) {
    const sortedArray = array.sort((a, b) => (a - b));
    const cleanArray = [...new Set(sortedArray)];
    const N = cleanArray.reduce((total, value, i, arr) => {
        if (value !== total + 1) {
            const n = value + 1
            return n > 0 ? n : 1
        }
        return total
    }, 0);
    return N
}