How to use

VALID_USERNAMES

function

in

Array

static verifyCredentials(username, password) {
  if (password !== Credentials.VALID_PASSWORD) {
   return false;
  }

  if (Credentials.VALID_USERNAMES.indexOf(username) < 0) {
   return false;
  }

  // If we're here, we had a valid username and password.
  // Store the username in our session storage.
  SyncStorage.set('session-username', username);

  return true;
 }