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

Array's indexOf method is sweet. It returns the position of an element in the array, if it exists, or returns -1 if it does not.

var goodUsers = ["someuser1", "someuser2", "someuser3"];
var users = ["someuser1", 'basuser'];
var user;

for (var i=0; i < users.length; i++) {
  user = users[i];
  if (goodUsers.indexOf(user) >= 0) {
    console.log(user + ' is a good user');
  } else {
    console.log(user + ' is BAD!!!');
  }
}​

http://jsfiddle.net/qz5fx/1