Javascript compare items in one array

Question

Pardon my complete lack of javascript knowledge in advance, but I can\'t seem to find a good example of how to compare two arrays and create another array based the results.

Answer 1

The brute force method would be something like this:

var users = []; // here is where you get the users from the device
var goodUsers = []; // here you get your good users list
var badUsers = []; // initialize an empty array for bad users

for (var i=0; i< users.length; i++) {
    var isAGoodUser = false;
    for(var y=0; y< goodUsers.length; y++) {
        if(users[i] == goodUsers[y]) {
            printf('Username: ' + users[i] + ' is good\n');
            isAGoodUser = true;
            break;
        }
    }
    if(!isAGoodUser){
        printf('Username: ' + users[i] + ' is NOT good\n');
        badUsers.push(users[i]);
    }
}