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:

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C++General-purpose, portable, free-form, multi-paradigm language
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COBOLCommon Business-Oriented Language
CoffeeScriptTranscompiles into JavaScript inspired by Ruby, Python and Haskell
CoqDependently typed language similar to Agda, Idris, F* and others
CrystalGeneral-purpose, concurrent, multi-paradigm, object-oriented language
CSSCSS (Cascading Style Sheets) specifies a web page’s appearance
DGeneral-purpose systems programming language with a C-like syntax
DartClient-optimized language for fast apps on multiple platforms
DylanMulti-paradigm language supporting functional and object-oriented coding
ECMAScriptBest known as the language embedded in web browsers
EiffelObject-oriented language designed by Bertrand Meyer
ElixirRelatively new functional language running on the Erlang virtual machine
ErlangGeneral-purpose, concurrent, declarative, functional language
F#Uses functional, imperative, and object-oriented programming methods
FactorDynamic stack-based programming language
ForthImperative stack-based programming language
FortranThe first high-level language, using the first compiler
GoCompiled, statically typed programming language
GroovyPowerful, optionally typed and dynamic language
HaskellStandardized, general-purpose, polymorphically, statically typed language
HTMLHyperText Markup Language
IconWide variety of features for processing and presenting symbolic data
JArray programming language based primarily on APL
JavaGeneral-purpose, concurrent, class-based, object-oriented, high-level language
JavaScriptInterpreted, prototype-based, scripting language
JuliaHigh-level, high-performance language for technical computing
KotlinMore modern version of Java
LabVIEWDesigned to enable domain experts to build power systems quickly
LaTeXProfessional document preparation system and document markup language
LispUnique features - excellent to study programming constructs
LogoDialect of Lisp that features interactivity, modularity, extensibility
LuaDesigned as an embeddable scripting language
MarkdownPlain text formatting syntax designed to be easy-to-read and easy-to-write
Objective-CObject-oriented language that adds Smalltalk-style messaging to C
OCamlThe main implementation of the Caml language
PascalImperative and procedural language designed in the late 1960s
PerlHigh-level, general-purpose, interpreted, scripting, dynamic language
PHPPHP has been at the helm of the web for many years
PostScriptInterpreted, stack-based and Turing complete language
PrologA general purpose, declarative, logic programming language
PureScriptSmall strongly, statically typed language compiling to JavaScript
PythonGeneral-purpose, structured, powerful language
QMLHierarchical declarative language for user interface layout - JSON-like syntax
RDe facto standard among statisticians and data analysts
RacketGeneral-purpose, object-oriented, multi-paradigm, functional language
RakuMember of the Perl family of programming languages
RubyGeneral purpose, scripting, structured, flexible, fully object-oriented language
RustIdeal for systems, embedded, and other performance critical code
ScalaModern, object-functional, multi-paradigm, Java-based language
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ScratchVisual programming language designed for 8-16 year-old children
SQLAccess and manipulate data held in a relational database management system
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ValaObject-oriented language, syntactically similar to C#
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