As in all of Sadun’s programming best-sellers, The Swift Developer’s Cookbook translates modern best practices into dozens of well-tested, easy-to-apply solutions. This book’s code examples were created in response to real-world questions from working developers to reflect Swift’s newest capabilities and best practices. Each chapter groups related tasks together. You can jump straight to your solution without having to identify the right class or framework first.

Table of Contents:
Preface xiii How This Book Is Organized xiii About the Sample Code xiv Contacting the Author xv Chapter 1: Welcome to Modern Swift 1 Migrating Code 2 How to Migrate 2 Migration Lessons 4 Using Swift 4 Compiled Applications 4 Frameworks and Libraries 5 Scripting 5 REPL 6 Playgrounds 7 Other Swift 8 Learning Swift 8 Wrap-up 9 Chapter 2: Printing and Mirroring 11 Basic Printing 11 Printing Multiple Items 12 Adding Item Separators 13 String Interpolation 13 Controlling Line Feeds 14 Recipe: Printing to Custom Destinations 15 Printing to Strings 16 Printing to Custom Output Streams 17 Recipe: Printing and String Formats 18 Swift and Format Specifiers 19 Format Limitations 19 Conditional Compilation 20 Debug Printing 21 Custom Stream Output 21 Recipe: Postfix Printing 23 Quick Looks 24 Quick Look for Custom Types 24 Quick Looks for Custom Types in Playgrounds 25 Playground Quick Looks 25 Creating Custom Quick Looks for Playgrounds 26 Built-in Quick Look Types 27 Third-Party Rendering 28 Using Dump Functions 30 Building Custom Mirrors 31 Recursive Reflection 32 Building Basic Mirror Descriptions Using Protocol Conformance 33 Adding Header Docs 35 Building Header Documentation 35 Markdown Support 36 Keywords 37 Special Swift Concerns 40 Adding Images to Header Docs 40 Wrap-up 41 Chapter 3: Optionals?! 43 Optionals 101 43 Unwrapping Optionals 45 Forced Unwrapping 45 Conditional Binding 46 Conditional Binding and Type Casts 46 Binding Cascades 48 guard Statements 50 Implicitly Unwrapped Optionals 51 Guarding Failable Initializers 52 Optionals and Sentinel Values 53 Coalescing 55 Optional Assignment 55 Optional Patterns 56 Optional Chaining 58 Selector Testing and Optional Chaining 59 Subscripts 60 Optional Mapping 61 Maps and Chaining 61 Filtering nil Values with flatMap 62 Unmanaged Wrappers 62 Wrap-up 64 Chapter 4: Closures and Functions 65 Building a Function 65 Parameter Names 66 Label Conventions 66 Naming Methods and Functions 68 External and Local Parameters 69 Defaults 70 Constant and Variable Parameters 71 Modifying Parameters 72 Closures and Functions 73 Function Types 73 Using Tuple Arguments 74 Using Shorthand Argument Names 74 Inferred Closure Types 76 Parameter Type Inference 77 Declaring Type Aliases 78 Nested Functions 79 Tuples 80 From Tuples to Structs 82 Tuple Return Types 82 Variadic Parameters 83 Capturing Values 85 Autoclosures 87 Adding Default Closures 90 Currying 91 Why Curry? 92 Building Libraries 92 Partial Application 93 Currying Costs 94 Currying and Callbacks 94 Practical Currying 95 Passing Closures as Function Parameters 97 Wrap-up 99 Chapter 5: Generics and Protocols 101 Expanding to Generics 101 Protocols 102 Tokens 103 Type Constraints 104 Adopting Protocols 104 Declaring Protocols 105 Member Declarations 107 Building a Basic Protocol 109 Adding Protocol Default Implementations 110 Optional Protocol Requirements 111 Swift-Native Optional Protocol Requirements 112 Building Generic Types 113 Type Parameters 113 Generic Requirements 114 Conformance Requirements 115 Recipe: Same-Type Requirements 115 Generic Beautification 117 Legal Tokens 117 Matching Aliases 118 Protocol Alias Defaults 119 Collating Associated Types 119 Extending Generic Types 120 Using Protocols as Types 121 Protocol-Based Collections 121 Self Requirements 122 Protocol Objects and Self Requirements 123 Leveraging Protocols 124 Wrap-up 124 Chapter 6: Errors 125 Failing Hard 125 Fatal Errors 126 Assertions 126 Preconditions 127 Aborting and Exiting 128 Failing Gracefully 128 The ErrorType Protocol 129 Choosing Between Optionals and Error Handling 130 Swift Error Rules 130 Rule 1: Move Away from nil Sentinels 131 Rule 2: Use throw to Raise Errors 132 Rule 3: Use Error Types with Visible Access 133 Rule 4: Mark All Error-Participating Methods with throws 134 Rule 5: Use rethrows Consistently 134 Rule 6: Consume Errors Where They Matter 135 Rule 7: Terminate Threaded Error Chains 135 Building Errors 137 Good Errors 138 Naming Your Errors 138 Adding String Descriptions 139 Adding Reasons 139 Simplifying Output 140 Extending String 140 Type-Specific Errors 141 Retrieving Context 141 Contextualizing Strings 142 Contextualizing Throwing Types 143 Simplifying Contexts 144 Calling Throwing Functions 145 Using try 145 Error Propagation 147 Using try! 148 Using try? 148 Implementing Alternatives to try? 149 Guarding Results 151 Building a Printing Version of try? 151 Working with guard and defer 151 Wrap-up 153 Chapter 7: Types 155 Language Concepts 155 Reference and Value Types 155 Copy-and-Write-Back 156 Algebraic Data Types 157 Other Terminology 158 Enumerations 159 Basic Enumerations 159 Using Hash Values to Support Ranges 160 Raw Value Enumerations 162 Raw Value Members and Sequences 163 Associated Values 164 Indirect Values 165 Switches 166 Branching 166 Breaks 167 Fallthroughs 167 Complex Cases 169 Tuples 169 Pattern Matching with Value Bindings 169 where Clauses 170 Unwrapping Optional Enumerations 171 Embedding Values by Type 172 Option Sets 174 Revisiting NS_OPTIONS 174 Building Enumerations 175 Building Option Sets 176 Viewing Options 176 Classes 177 Optimization 178 Initializers 178 Initialization Steps 179 Designated and Convenience Initializers 179 Initialization Rules 179 Building Convenience Initializers 181 Failable and Throwing Initializers 181 Deinitializers 183 Property Observers 184 Getters/Setters and Access-Level Modifiers 185 Extensions and Overrides 186 Lazy Evaluation 187 Lazy Sequences 187 Lazy Properties 188 Wrap-up 188 Chapter 8: Miscellany 189 Statement Labels 189 Custom Operators 190 Declaring Operators 191 Conforming with Operators 192 Evaluating Operator Trade-offs 192 Array Indexing 193 Multi-indexed Array Access 194 Wrapped Indices 195 Array Slices 195 General Subscripting 196 Parameter-less Subscripting 197 String Utilities 198 Repeat Initializers 198 Strings and Radix 198 String Ranges 199 String Splitting 201 String Subscripts 201 Foundation Interoperability 203 Joining and Extending 203 Permutation Generator 203 Wrap-up 205 Index 207