Check element in array with different objects

Question

I have an array with custom objects by 2 types. Also I have TableView, which shows objects from array. I need to select tableViewCell and check, if the element already in array - remove it from array, otherwise add it to array. I know, there is method for the checking array.contains(element) but my array looks like [Any] and it doesn't have this method.

I'm trying to check it with use for-in, but it's not good solution.

How can I do this?

let a: Int = 5
let b: String = "3"
let array: [Any] = [a, b]

check solution there stackoverflow.com/questions/34778950/… — Abdelahad Darwish
– Abdelahad Darwish, Commented May 4, 2018 at 6:39

Vlad Khambir · Accepted Answer · 2018-05-04 07:04:20Z

2

You are able to cast Any to Int or String type and just use array.contains

array.contains {
    if let intValue = $0 as? Int {
        return intValue == 3
    } else if let stringValue = $0 as? String {
        return stringValue == "3"
    }
    return false
}

OR use this extension (Swift 4):

extension Array where Element: Any {
    func contains<T: Equatable>(_ element: T) -> Bool {
        return contains {
            guard let value = $0 as? T else { return false }
            return value == element
        }
    }
}


array.contains("3") // true for your example

edited May 4, 2018 at 7:04

answered May 4, 2018 at 6:36

Vlad Khambir

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8 Comments

Sergey Hleb Over a year ago

in example only 2 base classes, but in my code this is 4 or more custom classes

Vlad Khambir Over a year ago

@SergeyHleb I have just added extension for array, use this extension for any your custom type.

Sergey Hleb Over a year ago

let me few minutes, I check this

Sergey Hleb Over a year ago

I'm trying your suggestion, but there is Use of unresolved identifier 'array'. I doing something stupid thing like: (_ element: T, array: [Any]), and in call it looks like: addingDevices.contains(device, array: addingDevices), but it works perfect, thank you.

TheTiger Over a year ago

Replace array.contains with self.contains in extension. Otherwise no benefit in making of extension.

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