function hidedata(message, start = 4, end = 2) {
    var array = [...String(message)];
    var message = "";
    var num_start = start;
    var num_end = array.length - end;
    for (var i = 0; i < array.length; i++) {
        var loop_data = array[i];
        if (i == num_end) {
            num_end--;
            message += loop_data
        } else if (i == num_start) {
            num_start++;
            message += "*";
        } else {
            message += loop_data
        }
    }
    return message;
}

console.log(hidedata(62788628121212)) // log 6278********12
console.log(hidedata("azkagantengbanget@email.com", 2, 10) // log az***************@email.com