Singleton and Prototype Pattern

Author: Sebastian Boldt

Behavioral.playground/Pages/Intro.xcplaygroundpage/Contents.swift

@@ -0,0 +1,25 @@
+//: [Previous](@previous)
+
+import Foundation
+
+struct ComplexToConstruct {
+    public var complexToCompute : Int = {
+        print("Constructed just once")
+        var sum = 0
+        for i in 0...100 {
+            sum = sum + i
+        }
+        
+        return sum
+    }()
+    
+    
+    public func clone() -> ComplexToConstruct {
+        return ComplexToConstruct(complexToCompute: self.complexToCompute)
+    }
+}
+
+let complex = ComplexToConstruct()
+complex.complexToCompute
+complex.clone().complexToCompute
+//: [Next](@next)

Creational.playground/Pages/Prototype.xcplaygroundpage/Contents.swift

@@ -0,0 +1,10 @@
+//: [Previous](@previous)
+
+import Foundation
+
+struct JustOnce {
+    public static let internalInstance : JustOnce = JustOnce()
+    private init() {}
+}
+
+//: [Next](@next)

Creational.playground/Pages/Singleton.xcplaygroundpage/Contents.swift

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='6.0' target-platform='ios'>
+    <pages>
+        <page name='Singleton'/>
+        <page name='Prototype'/>
+    </pages>
+</playground>

Creational.playground/contents.xcplayground

@@ -18,16 +18,16 @@ Inspired by: https://github.com/ochococo/Design-Patterns-In-Swift
 
 ##Creational
 
+* ✅ Singleton
+* ✅ Prototype
 * Abstract Factory
 * Builder
 * Factory Method
-* Prototype
-* Singleton
 
 ##Structural
 
-* Adapter
 * ✅ Bridge
+* Adapter
 * Composite
 * Decorator
 * Facade