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I want to turn my array into generic with my code. I'm new when it comes to generics.

Here is my code:

class APIServices 
 static let youtubeBaseURL = "https://www.googleapis.com/youtube/v3/search"

 static let shared = APIServices()

 func fetchVideo(name: String, completionHandler: @escaping ([Item]) -> ()) 
 let apiKey = "mykey"
 let params = ["part": "snippet", "q": "tausiyah (name)", "key": apiKey]

 Alamofire.request(APIServices.youtubeBaseURL, method: .get, parameters: params, encoding: URLEncoding.default, headers: nil).responseData (dataResponse) in
 if let err = dataResponse.error 
 print("Failed to get data:", err)
 return
 
 guard let data = dataResponse.data else return 

 do 
 let youtubeData = try JSONDecoder().decode(YoutubeModel.self, from: data)

 completionHandler(youtubeData.items)
 catch let decodeErr 
 print("Failed to decode youtube data:", decodeErr)
 
 
 

here my YoutubeModel

struct YoutubeModel: Decodable 
var items: [Item]


struct Item: Decodable 
 var id: VideoId
 var snippet: Snippet


struct VideoId: Decodable 

var videoId: String

init(dictionary: [String: Any]) 
 self.videoId = dictionary["videoId"] as? String ?? ""
 


struct Snippet: Decodable 

 func encode(with aCoder: NSCoder) 
 aCoder.encode(title, forKey: "titleStringKey")
 

 var title: String

In the completionHandler: @escaping ([item]) that I want to turn into generic. How can I change completionHandler below JSONDecoder?

You can try the below generic implementation,

public class YoutubeModel<T: Decodable>: Decodable 

 public var items: [T] = 


class APIServices 
 static let youtubeBaseURL = "https://www.googleapis.com/youtube/v3/search"

 static let shared = APIServices()

 func fetchVideo<T: Decodable>(name: String, of type: T.Type, completionHandler: @escaping ([T]) -> ()) 
 let apiKey = "mykey"
 let params = ["part": "snippet", "q": "tausiyah (name)", "key": apiKey]

 Alamofire.request(APIServices.youtubeBaseURL, method: .get, parameters: params, encoding: URLEncoding.default, headers: nil).responseData (dataResponse) in
 if let err = dataResponse.error 
 print("Failed to get data:", err)
 return
 
 guard let data = dataResponse.data else return 

 do 
 let youtubeData = try JSONDecoder().decode(YoutubeModel<T>.self, from: data)

 completionHandler(youtubeData.items)
 catch let decodeErr 
 print("Failed to decode youtube data:", decodeErr)
 
 
 

Usage

APIServices.shared.fetchVideo(name: "name", of: Item.self) list in
 print(list)