How to validate array value already exist or not

Question

My task is picking files from iCloud and it's url,title,etc. ,then appending into item array . After that, I am taking each values with help of struct and listing in tableView .

Here, one thing I need to understand, how to validate user picked files already exist or not into my array. If exist, I don't allow to append their file with alert message.

// Array Declaration
var items = [Item]()
var tableArray = [Item]() 

// Values appending into my array
items.append(Item(url: fileurl, title: filename, exten: fileextension, size: string))

// Tableview data load
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! CustomTableViewCell
    let item = tableArray[indexPath.row]

        if tableArray.count > 0 {
            cell.name_label_util.text = item.title
            cell.size_label_util.text = item.size
        }
    return cell
}

Answer 1

You can check whether Item is already existed or not, by adding a filter on existing items array. If result is nil then add the new item object.

Note: I am using url to check, it should be unique. Or replace it with unique key in Item modal.

if items.filter({ $0.url == fileurl }).first == nil {
    items.append(Item(url: fileurl, title: filename, exten: fileextension, size: string))
}

Alternatives:

if items.index(where: { $0.url == fileurl }) == nil {
    items.append(Item(url: fileurl, title: filename, exten: fileextension, size: string))
}

Answer 2

You can use contains(where:) to check if the array contains the element by comparing the unique properties in the class.

if !items.contains(where: {$0.url == fileUrl}) {
    items.append(yourItem)
}