Kotlin notes

Prerequisites

It is recommended the knowledge of Java (core) programming language.

Table of contents

• Basics
  • Variables
    • Type inference
    • Null values
    • Constant variables
    • Top level variables
  • Flow control statements
• Functions
  • Main function
  • Free function
  • Single expression functions
  • Input & Output
  • Lambdas
  • vararg
  • Named parameters
  • Default values
  • inline keyword
• Collections
  • Array
  • List
  • Map
• Classes
  • Creation
  • Instantiation
  • Constructors
  • Getters & Setters
  • Methods
  • equals
  • Visibility modifier
  • Abstract classes
• Interfaces
  • Creation
  • Implementation
  • Adding method to interfaces
  • Default implementation
  • Interfaces' variables
  • is and as operators: type checking and smart casting
• Inheritance
  • open keyword
  • Extend a class
  • Extention functions and extention properties
• Special classes
  • Object expressions
  • Companion objects
  • Object declaration
  • Enum classes
  • Sealed classes
  • Data classes
• Higher order functions
  • Creation
  • Nullable predicates
  • Variables that contain predicates
  • Functions that return predicates
  • Streams