Free Programming Books

Free Books to Learn Kotlin

Kotlin is a cross-platform, statically typed, general-purpose programming language with type inference. Kotlin is a more modern version of Java. It adopts functional ideas such as immutability and first-class functions, out of the box, and it is also object oriented.

Kotlin is designed to interoperate fully with Java, and the JVM version of its standard library depends on the Java Class Library, but type inference allows its syntax to be more concise. Kotlin mainly targets the JVM, but also compiles to JavaScript or native code (via LLVM).

Kotlin has been making waves since it was open sourced by JetBrains in 2011; it has been praised by developers across the world and is being adopted by companies.

Kotlin is published under the Apache License 2.0.

There are very few free books available for Kotlin. For more Kotlin-released resources, read our recommended free Kotlin tutorials.


1. Essential Kotlin maintained by Krzysztof Kowalczyk

Essential Kotlin Essential Kotlin is a free book about the Kotlin programming language.

It’s written to provide clear and concise explanation of topics for both beginner and advanced programmers.

Most examples are linked to online playground that allows you to change the code and re-run it.

The content is based on now abandoned StackOverflow Documentation project.

Read the book


2. Kotlin Quick Reference by Alvin Alexander

Kotlin - Quick ReferenceKotlin Quick Reference is intended to provide a quick reference to the Kotlin programming language. The idea is to show Kotlin syntax and examples with as few words as possible so that experienced developers who are new to Kotlin can find what they need quickly.

The target audience for this book is someone who already knows languages like Java and Scala and just needs a very quick reference to Kotlin’s syntax and some corresponding examples so they can be productive.

Each chapter in the book demonstrates Kotlin syntax and provides examples to explain the chapter’s topic. This is done in a brisk manner, with as few words as necessary.

Read the book


All books in this series:

Free Programming Books
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CGeneral-purpose, procedural, portable, high-level language
PythonGeneral-purpose, structured, powerful language
C++General-purpose, portable, free-form, multi-paradigm language
C#Combines the power and flexibility of C++ with the simplicity of Visual Basic
JavaScriptInterpreted, prototype-based, scripting language
PHPPHP has been at the helm of the web for many years
HTMLHyperText Markup Language
SQLAccess and manipulate data held in a relational database management system
RubyGeneral purpose, scripting, structured, flexible, fully object-oriented language
AssemblyAs close to writing machine code without writing in pure hexadecimal
SwiftPowerful and intuitive general-purpose programming language
GroovyPowerful, optionally typed and dynamic language
GoCompiled, statically typed programming language
PascalImperative and procedural language designed in the late 1960s
PerlHigh-level, general-purpose, interpreted, scripting, dynamic language
RDe facto standard among statisticians and data analysts
COBOLCommon Business-Oriented Language
ScalaModern, object-functional, multi-paradigm, Java-based language
FortranThe first high-level language, using the first compiler
ScratchVisual programming language designed for 8-16 year-old children
LuaDesigned as an embeddable scripting language
LogoDialect of Lisp that features interactivity, modularity, extensibility
RustIdeal for systems, embedded, and other performance critical code
LispUnique features - excellent to study programming constructs
AdaALGOL-like programming language, extended from Pascal and other languages
HaskellStandardized, general-purpose, polymorphically, statically typed language
SchemeA general-purpose, functional language descended from Lisp and Algol
PrologA general purpose, declarative, logic programming language
ForthImperative stack-based programming language
ClojureDialect of the Lisp programming language
JuliaHigh-level, high-performance language for technical computing
AwkVersatile language designed for pattern scanning and processing language
CoffeeScriptTranscompiles into JavaScript inspired by Ruby, Python and Haskell
BASICBeginner’s All-purpose Symbolic Instruction Code
ErlangGeneral-purpose, concurrent, declarative, functional language
VimLPowerful scripting language of the Vim editor
OCamlThe main implementation of the Caml language
ECMAScriptBest known as the language embedded in web browsers
BashShell and command language; popular both as a shell and a scripting language
LaTeXProfessional document preparation system and document markup language
TeXMarkup and programming language - create professional quality typeset text
ArduinoInexpensive, flexible, open source microcontroller platform
TypeScriptStrict syntactical superset of JavaScript adding optional static typing
ElixirRelatively new functional language running on the Erlang virtual machine
F#Uses functional, imperative, and object-oriented programming methods
TclDynamic language based on concepts of Lisp, C, and Unix shells
FactorDynamic stack-based programming language
EiffelObject-oriented language designed by Bertrand Meyer
AgdaDependently typed functional language based on intuitionistic Type Theory
IconWide variety of features for processing and presenting symbolic data
XMLRules for defining semantic tags describing structure ad meaning
ValaObject-oriented language, syntactically similar to C#
Standard MLGeneral-purpose functional language characterized as "Lisp with types"
DGeneral-purpose systems programming language with a C-like syntax
DartClient-optimized language for fast apps on multiple platforms
MarkdownPlain text formatting syntax designed to be easy-to-read and easy-to-write
KotlinMore modern version of Java
Objective-CObject-oriented language that adds Smalltalk-style messaging to C
PureScriptSmall strongly, statically typed language compiling to JavaScript
ClojureScriptCompiler for Clojure that targets JavaScript
VHDLHardware description language used in electronic design automation
JArray programming language based primarily on APL
LabVIEWDesigned to enable domain experts to build power systems quickly
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