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

You can use Swift Set:

let array = [product,product2,product3]

let set = Set(array)

You have to make Product conform to Hashable (and thus, Equatable) though:

class Product : Hashable {
    var subCategory = ""

    var hashValue: Int { return subCategory.hashValue }
}

func ==(lhs: Product, rhs: Product) -> Bool {
    return lhs.subCategory == rhs.subCategory
}

And, if Product was a NSObject subclass, you have to override isEqual:

override func isEqual(object: AnyObject?) -> Bool {
    if let product = object as? Product {
        return product == self
    } else {
        return false
    }
}

Clearly, modify those to reflect other properties you might have in your class. For example:

class Product : Hashable {
    var category = ""
    var subCategory = ""

    var hashValue: Int { return [category, subCategory].hashValue }
}

func ==(lhs: Product, rhs: Product) -> Bool {
    return lhs.category == rhs.category && lhs.subCategory == rhs.subCategory
}