From 19fdeb39296c6ddb69c9ee6b97e5901832832611 Mon Sep 17 00:00:00 2001
From: Konstantin <ckost9n@gmail.com>
Date: Thu, 4 Jun 2020 15:53:58 +0300
Subject: [PATCH] add 6 lesson

---
 .../Contents.swift                            | 45 +++++++++++++++++++
 .../contents.xcplayground                     |  4 ++
 2 files changed, 49 insertions(+)
 create mode 100644 6l_ChukarkovKonstantin.playground/Contents.swift
 create mode 100644 6l_ChukarkovKonstantin.playground/contents.xcplayground

diff --git a/6l_ChukarkovKonstantin.playground/Contents.swift b/6l_ChukarkovKonstantin.playground/Contents.swift
new file mode 100644
index 0000000..d8b0348
--- /dev/null
+++ b/6l_ChukarkovKonstantin.playground/Contents.swift
@@ -0,0 +1,45 @@
+
+struct Stack<Element> {
+    
+    var items = [Element]()
+    mutating func push(_ item: Element) {
+        items.append(item)
+    }
+    
+    mutating func pop() -> Element {
+        return items.removeLast()
+    }
+    
+    mutating func append(_ item: Element) {
+        self.push(item)
+    }
+    
+    
+    var count: Int {
+        return items.count
+    }
+    
+    subscript(i: Int) -> Element? {
+        if i < items.count {
+            return items[i]
+        }
+        return nil
+    }
+    
+}
+
+
+var stack = Stack<String>()
+
+stack.push("кот")
+stack.push("бегемот")
+stack.push("жираф")
+stack.push("крыса")
+
+stack.pop()
+
+print(stack.count)
+
+
+print(stack[1]!)
+print(stack[4] as Any)
diff --git a/6l_ChukarkovKonstantin.playground/contents.xcplayground b/6l_ChukarkovKonstantin.playground/contents.xcplayground
new file mode 100644
index 0000000..5da2641
--- /dev/null
+++ b/6l_ChukarkovKonstantin.playground/contents.xcplayground
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='ios'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>
\ No newline at end of file