Usernames

function solve(arr) {
    let set = new Set();
    for (let input of arr) {
        set.add(input);
    }
    let userNames = [...set.keys()].sort((a, b) => sortFunc(a, b));
    for (let users of userNames) {
        console.log(users);
    }
}

function sortFunc(a, b) {
    if (a.length != b.length) {
        return a.length - b.length;
    }
    else {
        return a.localeCompare(b);
    }
}