Unique Objects inside a Array Swift

Question

I have an array, with custom objects.

I Would like to pop the repeated objects, with the repeated properties:

let product = Product()
product.subCategory         


        

Answer 1

Here is an Array extension to return the unique list of objects based on a given key:

extension Array {
    func unique(map: ((Element) -> (T)))  -> [Element] {
        var set = Set() //the unique list kept in a Set for fast retrieval
        var arrayOrdered = [Element]() //keeping the unique list of elements but ordered
        for value in self {
            if !set.contains(map(value)) {
                set.insert(map(value))
                arrayOrdered.append(value)
            }
        }

        return arrayOrdered
    }
}

using this you can so this

let unique = [product,product2,product3].unique{$0.subCategory}

this has the advantage of not requiring the Hashable and being able to return an unique list based on any field or combination