How to merge dictionaries in swift 5

import UIKit

class ViewController: UIViewController {

let dict1: [String: Any] = ["kFacebook": ["kToken": "token"]]
let dict2: [String: Any] = ["kRequest": ["kTargetUserId": "userId"]]
let dict3: [String: Any] = ["pRequest": ["kTargetUserId": "userId"]]

var combinedAttributes : NSMutableDictionary!

override func viewDidLoad() {
super.viewDidLoad()


combinedAttributes = NSMutableDictionary(dictionary: dict1)

combinedAttributes.addEntries(from: dict2)
combinedAttributes.addEntries(from: dict3)

print(combinedAttributes)
// Do any additional setup after loading the view.
}


}