Remove duplicate objects in an array - Hashable, CustomStringConvertible

RemoveDuplicateObjects.playground

//Reference: 

//https://stackoverflow.com/questions/34709066/remove-duplicate-objects-in-an-array
//https://medium.com/@YogevSitton/use-auto-describing-objects-with-customstringconvertible-49528b55f446


func uniq<S: Sequence, E: Hashable>(_ source: S) -> [E] where E == S.Iterator.Element {
    var seen = Set<E>()
    return source.filter { seen.update(with: $0) == nil }
}


struct Post : Hashable, CustomStringConvertible {
    var id : Int
    var hashValue : Int { return self.id }
    
    //Using Swift’s reflection capabilities we print the class’ name, iterate through the properties and print their values.
    var description: String {
       // return "\(hashValue)" //"\(id)"
        var description = "\(type(of: self))]-"
        let selfMirror = Mirror(reflecting:self)
        for child in selfMirror.children {
            if let propertyName = child.label {
                description += "\(propertyName): \(child.value)"
            }
        }
        return description
    }
}

func == (lhs: Post, rhs: Post) -> Bool {
    return lhs.id == rhs.id
}

var posts : [Post] = [Post(id: 1), Post(id: 7), Post(id: 2), Post(id: 1), Post(id: 3), Post(id: 5), Post(id: 7), Post(id: 9)]
print(posts)
/* [Post(id: 1), Post(id: 7), Post(id: 2), Post(id: 1), Post(id: 3), Post(id: 5), Post(id: 7), Post(id: 9)] */


var myUniquePosts = uniq(posts)
print(myUniquePosts)
/* [Post(id: 1), Post(id: 7), Post(id: 2), Post(id: 3), Post(id: 5), Post(id: 9)] */