HomeWork 4

lesson6/main.swift

@@ -0,0 +1,89 @@
+//
+//  main.swift
+//  lesson6
+//
+//  Created by Vladislav Elkin on 03.08.2020.
+//  Copyright © 2020 Vladislav Elkin. All rights reserved.
+//
+
+import Foundation
+
+protocol Weightabe {                      // создаем протокол поддержки веса
+    var weight: Double { get set }
+}
+
+class Circle: Weightabe {                // имплементируем протокол кругу
+    var radius: Double
+    var weight: Double
+    func calculatePerimiter() -> Double {
+        return 2.0 * Double.pi * radius
+    }
+    init(radius: Double, weight: Double) {
+        self.radius = radius
+        self.weight = weight
+    }
+}
+
+struct Queue<T> {
+    private var elements: [T] = []
+
+    mutating func enqueue(_ element: T)
+    {
+        elements.append(element);
+    }
+
+    mutating func dequeue() -> T?
+    {
+        return size() > 0 ? elements.removeFirst() : nil;
+    }
+
+    func peak() -> T? {
+        return size() > 0 ? elements[0] : nil;
+    }
+
+    func size() -> Int
+    {
+        return elements.count;
+    }
+
+    mutating func clear()
+    {
+        elements.removeAll();
+    }
+
+    subscript(index: Int) -> T?
+    {
+        get
+        {
+            return elements.indices.contains(index) ? elements[index] : nil;
+        }
+    }
+}
+
+extension Queue {
+    func Filter(predicate:(T) -> Bool) -> [T] {
+        var result = [T]()
+        for i in elements {
+            if predicate(i) {
+                result.append(i)
+            }
+        }
+        return result
+    }
+}
+
+extension Circle: CustomStringConvertible{
+    var description: String {
+        return "Radius: \(radius) Weight: \(weight)"
+    }
+}
+
+var queue = Queue<Circle>();
+queue.enqueue(Circle(radius: 12, weight: 44));
+queue.enqueue(Circle(radius: 16, weight: 80));
+queue.enqueue(Circle(radius: 133, weight: 30));
+queue.enqueue(Circle(radius: 123, weight: 22));
+
+let filtredQueue = queue.Filter(predicate: {$0.radius > 12})
+
+print(filtredQueue)