Merge pull request #3813 from allbertoMD/Reto-#21

#21-Swift

Author: Roswell468

Roadmap/21 - CALLBACKS/swift/allbertoMD.swift

@@ -0,0 +1,59 @@
+import Foundation
+
+// Para el correcto funcionamiento del script se debe usar en un playground.
+
+func fetchData(from url: URL, completion: @escaping (Data?, Error?) -> Void) {
+    let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
+        completion(data, error)
+    }
+    task.resume()
+}
+
+if let url = URL(string: "https://swift.org") {
+    fetchData(from: url) { (data, error) in
+        if let error = error {
+            print("Error al fetch data: \(error)")
+        }
+        guard let dataResponse = data else {
+            fatalError()
+        }
+        if let dataSting = String(data: dataResponse, encoding: .utf8) {
+            print(dataSting)
+        }
+    }
+}
+
+
+
+
+// DIFICULTAD EXTRA
+print("\nDIFICULTAD EXTRA.")
+
+
+func order(name order: String, confirmation: @escaping (String) -> Void, done: @escaping (String) -> Void, delivery: @escaping (String) -> Void) {
+    
+    print("El pedido de \(order) ha sido realizado.")
+    
+    DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
+        confirmation(order)
+    }
+    
+    DispatchQueue.main.asyncAfter(deadline: .now() + 9) {
+        done(order)
+    }
+    
+    DispatchQueue.main.asyncAfter(deadline: .now() + 15) {
+        delivery(order)
+    }
+}
+
+
+
+order(name: "Alitas de pollo") { orderConfirmate in
+    print("\(orderConfirmate) confirmado.")
+} done: { orderDone in
+    print("\(orderDone) listo.")
+} delivery: { orderDelivery in
+    print("\(orderDelivery) entregado.")
+}
+