Swift user defaults - array

Question

Getting error on the below code as

Binary operator '==' cannot be applied to operands of type '[String]?' and 'String'

    func loadDefaults() {

    let userDefaults = UserDefaults.standard.object(forKey: "storedArray") as? [String]
    if (userDefaults == "") || userDefaults != nil{
        persons = userDefaults!
    }else{
        persons = [""]
    }

}

Answer 1

First of all there is a dedicated method array(forKey to retrieve an array.

An empty array isEmpty, you cannot compare it with an empty String

If you want to load the stored array or assign an empty array if the object can't be found use

func loadDefaults() {
    // a variable name userDefaults for the array is confusing
    if let storedArray = UserDefaults.standard.array(forKey: "storedArray") as? [String] {
        persons = storedArray
    } else {
        persons = []
    }
}

or shorter

func loadDefaults() {
    persons = UserDefaults.standard.array(forKey: "storedArray") as? [String] ?? []
}