Merge branch 'LazyGetter-master'

* LazyGetter-master:
  Generator type alias not required

Author: Oktawian Chojnacki

Design-Patterns.playground.zip

@@ -16,14 +16,16 @@ A short cheat-sheet with Xcode 6.3beta Playground ([Design-Patterns.playground.z
 * [Creational](#creational)
 * [Structural](#structural)
 
-*//*:
+*/
+/*:
 Behavioral
 ==========
 
 >In software engineering, behavioral design patterns are design patterns that identify common communication patterns between objects and realize these patterns. By doing so, these patterns increase flexibility in carrying out this communication.
 >
 >**Source:** [wikipedia.org](http://en.wikipedia.org/wiki/Behavioral_pattern)
-*//*:
+*/
+/*:
 🐝 Chain Of Responsibility
 --------------------------
 
@@ -535,7 +537,8 @@ Creational
 > In software engineering, creational design patterns are design patterns that deal with object creation mechanisms, trying to create objects in a manner suitable to the situation. The basic form of object creation could result in design problems or added complexity to the design. Creational design patterns solve this problem by somehow controlling this object creation.
 >
 >**Source:** [wikipedia.org](http://en.wikipedia.org/wiki/Creational_pattern)
-*//*:
+*/
+/*:
 🌰 Abstract Factory
 -------------------
 
@@ -781,7 +784,8 @@ Structural
 >In software engineering, structural design patterns are design patterns that ease the design by identifying a simple way to realize relationships between entities.
 >
 >**Source:** [wikipedia.org](http://en.wikipedia.org/wiki/Structural_pattern)
-*//*:
+*/
+/*:
 🔌 Adapter
 ----------
 
@@ -894,7 +898,8 @@ protocol Shape {
 }
 /*: 
 Leafs
-*/ 
+*/
+ 
 class Square : Shape {
     func draw(fillColor: String) {
         print("Drawing a Square with color \(fillColor)")
@@ -1124,4 +1129,4 @@ Info
 
 🚀 How to generate playground (+zip) from source: [GENERATE.md](https://github.com/ochococo/Design-Patterns-In-Swift/blob/master/GENERATE.md)
 
-*/
+*/

Design-Patterns.playground/contents.swift

@@ -0,0 +1,28 @@
+##🍫 Iterator
+
+The iterator pattern is used to provide a standard interface for traversing a collection of items in an aggregate object without the need to understand its underlying structure.
+
+**Example:**
+
+```swift
+struct Cart<T> {
+    let items: [T]
+}
+
+extension Cart: SequenceType {
+    
+    func generate() -> GeneratorOf<T> {
+        var i = 0
+        return GeneratorOf { return i >= self.items.count ? nil : self.items[i++] }
+    }
+}
+```
+
+***Usage***
+```swift
+let cart = Cart(items: ["foo", "bar", "baz"])
+
+for item in cart {
+    println(item)
+}
+```