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The Kotlin Primer
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Introduction
💡 · Understanding the Kotlin Primer
💡 · Maintainability
Basics
Functions & Variables
🚙 · Functions
🚙 · Variables
Control Flow
🏎️ · When expression
🚙 · Loops
🚙 · If expression
Miscellaneous
🏎️ · Ranges
🏎️ · Strings & string templates
Nullability & Types
🏎️ · Nullability ⚙️
🚀 · Types
Functions continued
🚙 · Literals
🚗 · Function types & literals ⚙️
🏎️ · Inline functions
🏎️ · Tail-recursive functions
🚙 · Variable number of arguments
Classes — What we know from Java
Introduction
🚙 · Basic class syntax
🏎️ · Constructors ⚙️
Properties
🏎️ · Basics
🏎️ · Accessors
🏎️ · Backing fields
🚗 · Accessors, continued ⚙️
🚙 · Compile-time constants
🏎️ · Lateinit
Inheritance
🚙 · Basics
🚙 · Overriding
Miscellaneous
🚙 · Interfaces
🚙 · Visibility modifiers
🏎️ · Nested and inner classes
Generics
🚗 · Basics
🚗 · Generic variance – motivation
🚗 · Generic variance – fundamental principles
🏎️ · Covariance, Contravariance, Invariance
🏎️ · Star Projections
Classes — What’s new in Kotlin
Data Classes
🏎️ · Data Classes ⚙️
Objects
🏎️ · Object Declarations
🏎️ · Object Expressions
🏎️ · Companion Objects ⚙️
Delegation
🚀 · Delegating interface implementation ⚙️
🚀 · Delegated Properties ⚙️
🚀 · Summary
Sealed hierarchies
🚗 · Introduction
🚀 · Safely Emulating Dynamic Dispatch
🚀 · Modeling Illegal States
🚀 · Modeling States and Structure
🚀 · Modeling States and Structure: Considerations
Miscellaneous
🏎️ · Reified Type Parameters
🚗 · Enums
🏎️ · Infix Functions
🏎️ · Operators
🏎️ · Type Aliases
🚀 · Inline (Value) Classes
🚗 · Functional (SAM) Interfaces
Extension Functions
Basics
🚀 · Motivation
🚀 · Syntax and Behavior
🚀 · Functions with Receiver
🏎️ · Qualified This ⚙️
🚀 · What Extension Functions Are Not
Applications
🚀 · Nullable & Generic Receivers ⚙️
🏎️ · Generic Receivers — continued
🏎️ · Operators as Extensions
Scope functions
🚀 · Introduction
🚀 · also() & apply()
🚀 · also() vs. apply()
🚀 · let() & takeX()
🚀 · run()
🚀 · with(), run() vs. with()
🚀 · Closing Remarks & Exercises ⚙️
Domain Specific Languages
🚀 · What makes a DSL
🚀 · How to make your own ⚙️
Standard Library
Programming with Result
🚀 · Motivation
🚀 · Returning a Result
🚀 · kotlin.Result
🚀 · Combining and Composing Results
🚀 · Considerations
Collections & Elementary Functional Programming
🚗 · Basic Collections: Introduction
🚗 · Functional vs. (?) Object-Oriented Programming
🚗 · Collection Operations: Overview
🚗 · Transformations
🚗 · Filtering
🚗 · Single-element access
🚗 · Predicates
🚗 · Aggregators
🚗 · Grouping
Sequences
🚗 · Why we need them
🚗 · How They Work & How To Use Them
🚀 · Yield vs. Return & How Pausing Functions Work
🚗 · Iterable vs. Sequence vs. Java Stream
Nullability & Types
🏎️ · Nullability ⚙️
🚀 · Types
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The Kotlin Primer
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Introduction
💡 · Understanding the Kotlin Primer
💡 · Maintainability
Basics
Functions & Variables
🚙 · Functions
🚙 · Variables
Control Flow
🏎️ · When expression
🚙 · Loops
🚙 · If expression
Miscellaneous
🏎️ · Ranges
🏎️ · Strings & string templates
Nullability & Types
🏎️ · Nullability ⚙️
🚀 · Types
Functions continued
🚙 · Literals
🚗 · Function types & literals ⚙️
🏎️ · Inline functions
🏎️ · Tail-recursive functions
🚙 · Variable number of arguments
Classes — What we know from Java
Introduction
🚙 · Basic class syntax
🏎️ · Constructors ⚙️
Properties
🏎️ · Basics
🏎️ · Accessors
🏎️ · Backing fields
🚗 · Accessors, continued ⚙️
🚙 · Compile-time constants
🏎️ · Lateinit
Inheritance
🚙 · Basics
🚙 · Overriding
Miscellaneous
🚙 · Interfaces
🚙 · Visibility modifiers
🏎️ · Nested and inner classes
Generics
🚗 · Basics
🚗 · Generic variance – motivation
🚗 · Generic variance – fundamental principles
🏎️ · Covariance, Contravariance, Invariance
🏎️ · Star Projections
Classes — What’s new in Kotlin
Data Classes
🏎️ · Data Classes ⚙️
Objects
🏎️ · Object Declarations
🏎️ · Object Expressions
🏎️ · Companion Objects ⚙️
Delegation
🚀 · Delegating interface implementation ⚙️
🚀 · Delegated Properties ⚙️
🚀 · Summary
Sealed hierarchies
🚗 · Introduction
🚀 · Safely Emulating Dynamic Dispatch
🚀 · Modeling Illegal States
🚀 · Modeling States and Structure
🚀 · Modeling States and Structure: Considerations
Miscellaneous
🏎️ · Reified Type Parameters
🚗 · Enums
🏎️ · Infix Functions
🏎️ · Operators
🏎️ · Type Aliases
🚀 · Inline (Value) Classes
🚗 · Functional (SAM) Interfaces
Extension Functions
Basics
🚀 · Motivation
🚀 · Syntax and Behavior
🚀 · Functions with Receiver
🏎️ · Qualified This ⚙️
🚀 · What Extension Functions Are Not
Applications
🚀 · Nullable & Generic Receivers ⚙️
🏎️ · Generic Receivers — continued
🏎️ · Operators as Extensions
Scope functions
🚀 · Introduction
🚀 · also() & apply()
🚀 · also() vs. apply()
🚀 · let() & takeX()
🚀 · run()
🚀 · with(), run() vs. with()
🚀 · Closing Remarks & Exercises ⚙️
Domain Specific Languages
🚀 · What makes a DSL
🚀 · How to make your own ⚙️
Standard Library
Programming with Result
🚀 · Motivation
🚀 · Returning a Result
🚀 · kotlin.Result
🚀 · Combining and Composing Results
🚀 · Considerations
Collections & Elementary Functional Programming
🚗 · Basic Collections: Introduction
🚗 · Functional vs. (?) Object-Oriented Programming
🚗 · Collection Operations: Overview
🚗 · Transformations
🚗 · Filtering
🚗 · Single-element access
🚗 · Predicates
🚗 · Aggregators
🚗 · Grouping
Sequences
🚗 · Why we need them
🚗 · How They Work & How To Use Them
🚀 · Yield vs. Return & How Pausing Functions Work
🚗 · Iterable vs. Sequence vs. Java Stream
