function list(list2) {
    let low = 0;
    let high = list2.length - 1;
    for (let i in list2) {
        if (low < high) {
            list2[low] = list2[high]
            list2[high] = list2[low]
            low = low + 1
            high = high - 1
        }
    }
    return list2
}
let list2 = [1, 3, 5, 7, 9];
console.log(list(list2))