About the Book
You can be a developer - even a good one - without understanding the topics explained in this book, but at some point, you’ll need it. You are likely using tools made using features described in this book every day, such as libraries based on annotation processing or compiler plugins, classes that use variance modifiers, functions with contracts, or property delegates, but do you understand these features? Would you be able to implement similar tools yourself? Would you be able to analyze and debug them? This book will make all this possible for you. It focuses exclusively on the most advanced Kotlin topics, which are often not well understood even by senior Kotlin developers. It should equip you with the knowledge you need and show you possibilities you never before imagined. I hope you enjoy it as much as I enjoyed writing it.
- Who is this book for?
- That will be covered?
- The structure of the book
- The Kotlin for Developers series
- Code conventions
Generic variance modifiers
- List variance
- Consumer variance
- Function types
- The Covariant Nothing Object
- The Covariant Nothing Class
- Variance modifier limitations
- UnsafeVariance annotation
- Variance modifier positions
- Star projection
- The delegation pattern
- Delegation and inheritance
- Kotlin interface delegation support
- Wrapper classes
- The decorator pattern
- Intersection types
- Conflicting elements from parents
- How property delegation works
- Implementing a custom property delegate
- Provide a delegate
- Property delegates in Kotlin stdlib
- A map as a delegate
- Review of how variables work
- The meaning of a contract
- How many times do we invoke a function from an argument?
- Implications of the fact that a function has returned a value
- Using contracts in practice
- Nullable types
- Kotlin type mapping
- JVM primitives
- Collection types
- Annotation targets
- Static elements
- Using Java accessors in Kotlin
- Function types and function interfaces
- Tricky names
Using Kotlin Multiplatform
- Multiplatform module configuration
- Expect and actual elements
- Multiplatform libraries
- A multiplatform mobile application
- Setting up a project
- Using libraries available for Kotlin/JS
- Using Kotlin/JS
- Building and linking a package
- Distributing a package to npm
- Exposing objects
- Exposing Flow and StateFlow
- Adding npm dependencies
- Frameworks and libraries for Kotlin/JS
- Hierarchy of classes
- Function references
- Parameter references
- Property references
- Class reference
- Serialization example
- Referencing types
- Type reflection example: Random value
- Kotlin and Java reflection
- Breaking encapsulation
- Your first annotation processor
- Hiding generated classes
Kotlin Symbol Processing
- Your first KSP processor
- Testing KSP
- Dependencies and incremental processing
- Multiple rounds processing
- Using KSP on multiplatform projects
Kotlin Compiler Plugins
- Compiler frontend and backend
- Compiler extensions
- Popular compiler plugins
- Making all classes open
- Changing a type
- Generate function wrappers
- Example plugin implementations
Static Code Analysers
- What are Static Analysers?
- Types of analysers
- Kotlin Code Analysers
- Setting up detekt
- Writing your first detekt Rule
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