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 a KeyPath based version of the Ciprian Rarau' solution

extension Array {
    func unique(by keyPath: KeyPath) -> [Element] {
        var set = Set()
        return self.reduce(into: [Element]()) { result, value in
            guard !set.contains(value[keyPath: keyPath]) else {
                return
            }
            set.insert(value[keyPath: keyPath])
            result.append(value)
        }
    }
}

example usage:

let unique = [product, product2, product3].unique(by: \.subCategory)