Cannot invoke 'append' with an argument list of type '(String?!)'

Question

I\'m trying to add usernames from Parse in an array to display them in a UITableView, but get an error when I\'m appending the usernames to my array.

The error I get is:

Answer 1

I solved my problem. I declare the array as an empty array and for unwrap the optional with the following code:

var usernames = [String]()

self.usernames.removeAll(keepCapacity: true)

    for fetchedUser in fetchedUsers! {
        if let username = fetchedUser.username as String! {
            self.usernames.append(username)
        }
    }