Kotlin Apprentice: Beginning Programming with Kotlin. 2 Ed

Introduction....18 Book License....19 Book Source Code & Forums....20 What You Need....22 About the Cover....23 Chapter 1: Your Kotlin Development Environment....26 Getting started with IntelliJ IDEA....27 Book sample projects....33 Challenges....37 Key points....38 Where to go from here?....38 Chapter 2: Expressions, Variables & Constants....39 How a computer works....40 Getting started with Kotlin....46 Printing out....47 Arithmetic operations....48 Math functions....53 Naming data....54 Increment and decrement....57 Challenges....58 Key points....60 Where to go from here?....61 Chapter 3: Types & Operations....62 Type conversion....63 Strings....67 Strings in Kotlin....69 Pairs and Triples....72 Number types....75 Any, Unit, and Nothing Types....76 Challenges....77 Key points....78 Where to go from here?....79 Chapter 4: Basic Control Flow....80 Comparison operators....81 The if expression....85 Loops....90 Challenges....94 Key points....95 Where to go from here?....96 Chapter 5: Advanced Control Flow....97 Ranges....98 For loops....98 when expressions....103 Challenges....108 Key points....109 Where to go from here?....109 Chapter 6: Functions....110 Function basics....111 Functions as variables....116 Challenges....119 Key points....121 Where to go from here?....121 Chapter 7: Nullability....122 Introducing null....123 Introducing nullable types....124 Checking for null....126 Safe calls....129 Elvis operator....130 Challenges....131 Key points....132 Where to go from here?....132 Chapter 8: Arrays & Lists....134 Arrays....134 Lists....138 Accessing elements....140 Modifying lists....144 Updating elements....146 Iterating through a list....147 Nullability and collection types....148 Challenges....149 Key points....151 Where to go from here?....151 Chapter 9: Maps & Sets....152 Creating maps....153 Accessing values....154 Modifying mutable maps....155 Iterating through maps....157 Running time for map operations....157 Key points....158 Sets....159 Creating sets....159 Accessing elements....160 Adding and removing elements....160 Running time for set operations....160 Challenges....161 Key points....162 Where to go from here?....162 Chapter 10: Lambdas....163 Lambdas basics....164 Custom sorting with lambdas....169 Iterating over collections with lambdas....169 Challenges....173 Key points....175 Where to go from here?....175 Chapter 11: Classes....178 Creating classes....178 Reference types....179 Understanding state and side effects....185 Data classes....186 Challenges....189 Key points....190 Where to go from here?....190 Chapter 12: Objects....191 Singletons....192 Getting started....193 Using static members....196 Using anonymous objects....199 Challenges....200 Key points....201 Where to go from here?....201 Chapter 13: Properties....202 Constructor properties....203 Property initializers....204 Custom accessors....205 Companion object properties....208 Delegated properties....210 lateinit....213 Extension properties....214 Challenges....215 Key points....216 Where to go from here?....216 Chapter 14: Methods....217 Method refresher....218 Introducing this....220 Object methods....221 Extension methods....223 Challenges....226 Key points....227 Where to go from here?....227 Chapter 15: Advanced Classes....228 Introducing inheritance....229 Sealed classes....237 Secondary constructors....238 Nested and inner classes....239 Visibility modifiers....240 When and why to subclass....242 Challenges....244 Key points....245 Where to go from here?....245 Chapter 16: Enum Classes....246 Creating your first enum class....247 Enum class properties and functions....251 Using when with enum classes....255 Sealed classes vs. enum classes....256 Enumeration as state machine....260 Nullables and enums....262 Challenges....263 Key points....264 Where to go from here?....264 Chapter 17: Interfaces....265 Introducing interfaces....266 Interface inheritance....270 Implementing multiple interfaces....271 Interfaces in the standard library....271 Challenges....273 Key points....274 Where to go from here?....274 Chapter 18: Generics....275 Anatomy of standard library generic types....276 Extension functions on types with generic constraints....282 Creating your own generic constraints....284 Generic interfaces....293 Type erasure....296 Generic type variance (a.k.a., in and out declarations)....304 Challenges....309 Key points....311 Where to go from here?....311 Chapter 19: Kotlin/Java Interoperability....314 Mixing Java and Kotlin code....315 Java nullability annotations....326 Making your Kotlin Code Java-friendly....330 Accessing nested Kotlin objects....334 "Static" values and functions from Kotlin....337 Challenge....340 Key points....341 Where to go from here?....341 Chapter 20: Exceptions....342 What is an exception?....343 Throwing exceptions....345 Handling exceptions....347 Creating custom exceptions....348 Difference between Java and Kotlin exceptions....351 Challenges....351 Key points....352 Where to go from here?....353 Chapter 21: Functional Programming....354 What is functional programming?....355 Robot battle!....356 First-class and higher-order functions....359 Lambdas....362 Extension functions....366 Lambdas with receivers....367 Anonymous functions....368 Returning from lambdas....369 Inline functions....370 Tail recursive functions....373 Collections standard library....374 Infix notation....375 Sequences....375 Challenges....377 Key points....377 Where to go from here?....378 Chapter 22: Conventions & Operator Overloading....379 What is operator overloading?....380 Getting started....380 Using conventions....381 Handling collections....385 Operator overloading and Java....389 Delegated properties as conventions....389 Challenges....390 Key points....390 Where to go from here?....391 Chapter 23: Kotlin Coroutines....392 Asynchronous programming....393 Coroutines....394 Getting started....395 Configuring coroutines....396 CoroutineScope....397 Coroutines builders....398 Example: A high-rise building....401 Error handling....407 Understanding coroutines....407 Challenges....408 Key points....408 Where to go from here?....409 Chapter 24: Scripting with Kotlin....410 What is scripting?....411 Installing Kotlin for scripting....412 Using the REPL....414 Creating script files....417 Handling arguments....424 Getting information from the system....427 Challenges....433 Key points....434 Where to go from here?....434 Chapter 25: Kotlin/Native....435 Konan and LLVM....436 Installation....436 Hello, Kotlin/Native....438 Kotlin Standard Library....440 Challenges....440 Key points....441 Where to go from here?....442 Chapter 26: Kotlin Multiplatform....443 The KMP Approach....444 HelloKMP....447 Shared project....449 expect and actual....452 Shared code from Android....455 The iOS app....456 Shared code from iOS....460 Challenge....463 Key points....463 Where to go from here?....463 Appendix A: Kotlin Platforms....464 Kotlin on the JVM....465 Android....465 Kotlin on the server....470 Kotlin to JavaScript....470 Kotlin/Native and Multiplatform....471 Where to go from here?....472 Conclusion....474