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Home > Programming > Programming Language > Kotlin Quick Start Guide
Kotlin Quick Start Guide
Kotlin Quick Start Guide

Kotlin Quick Start Guide: Core features to get you ready for developing applications

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Kotlin Quick Start Guide

Kotlin Basics

With Kotlin IDE installed, it is now time to start learning the basic elements of the language. In this chapter, you can learn about local variables and functions and basic Kotlin Types. If you are a Java programmer, in this chapter you'll see what sets Kotlin apart from Java. You'll see how type inference works and how Kotlin, with its support for Nullable Types, tries to prevent NullPointerExceptions.

Here is the complete overview of topics you will learn in this chapter:

  • Functions
  • Local variables
  • Local functions
  • Type inference
  • Basic types
  • Nullable types
  • Casting
  • Control flow
  • Exceptions
  • Packages
  • Visibility modifiers

Functions

Functions in Kotlin are declared with the fun keyword. Following the keyword comes the function name, then parentheses, which contain optional function parameters. In Kotlin, return type comes at the end of the function definition, after a colon.

Here's a function in Kotlin that adds two numbers and returns the result:

fun add(a: Int, b: Int): Int {
    val result: Int = a + b 
    return result
}

This function accepts two parameters of type Int (32-bit integer), has a local variable of type Int, and also returns an Int.

If you are familiar with Java, you might have noticed that types of parameters and local variables come after their name. In Java their type declaration comes first.

Calling this function would look like this:

val result: Int = add(1, 1)

In Java, every declaration, such as a field or a function, has to be inside a class. Kotlin doesn’t have...

Local variables

Local variables can be declared in two ways: first, with the val  keyword, then they are immutable (the variable cannot be reassigned). If you are coming from Java, val would be equal to variables declared with a final keyword.

Secondly, you can declare a local variable with a var keyword; then it is considered mutable and the value can be reassigned after a declaration.

The following command demonstrates that it will not compile, because the bar local variable cannot be reassigned:

fun immutable() {
   val bar: String = "Kotlin"
   bar = "Kotlin is awesome" // compiler error
}

And, when declared with var, the compiler allows a local variable to be reassigned:

fun mutable() {
   var bar: String = "Kotlin"
   bar = "Kotlin is awesome" 
}

You should favor immutable variables. The compiler will...

Local functions

Local functions are functions declared inside a function. They are also called nested functions. They are popular in scripting languages, but some other modern Object-Oriented languages, like Scala, Swift, and C# (since 7.0) also have them. One of the uses of local functions is code reuse. You can extract a piece of code that is repeated inside a local function so the code can be reused:

fun printUserDetails(user: User) {
    fun tryPrint(str: String) {
        if (str.length > 5) {
            println(str)
        } 
       else  {
            println("I print strings with more than 5 characters")
       }
    }
    tryPrint(user.firstName)
    tryPrint(user.lastName)
    tryPrint(user.address)
}

You can see how the function tryPrint is declared inside the printUserDetails function.  We can call the nested function just as we would a normal function...

Type inference

Declaring types in Kotlin is optional. This is a feature of a Kotlin compiler called Type inference. The compiler can infer the type from the context of the usage. Kotlin is a strongly and statically typed language, so omitting types doesn’t mean that you lose type safety. 

Here’s an example of type inference:

val str = "Kotlin"

str variable is of type String and the compiler knows this from the String literal that is initializing the variable. That’s why, if you try to assign a different type to this variable, you'll get a compiler error, as can be seen in the following:

var str = "Kotlin"
str = 1 // compiler error

Type inference doesn’t just work on local variables, but also on functions with expression bodies, generic types, closures and lambdas. You’ll see more type inference in practice in following...

Basic types

If you are familiar with Java, then you probably know that Java has primitive (value) types and reference types.

The differences between them are that primitive type variables store the actual value of the type in their memory location (usually on the Stack) and reference type variables store the reference (memory address) to another memory location (on the Heap) where the actual data is stored.

Primitive types in Java also have their Boxed (Boxing is an automatic conversion of a primitive type to a reference type) version, a reference type. For example, a primitive int (32-bit integer) has a reference type in type Integer.

Kotlin doesn’t have this distinction between primitive and reference type. This doesn’t mean a Kotlin compiler cannot emit primitive types in Java bytecode. In fact, it would be really inefficient if Kotlin had only reference...

Nullable types

When you want to state that a reference type doesn’t point to a memory address, you can assign it a null value. If you have ever used Java, you probably experienced the NullPointerException fail, as it is one of the most common errors. This error is raised by the runtime when you dereference a null variable.

This decision, to have nulls in Java, is criticized a lot and is also sometimes called  a Billion Dollar mistake. The introduction of the optional type in Java 8, tries to address this problem.

Kotlin tries to prevent these mistakes with supporting nullability in its type system. With nullable types, Kotlin tries to prevent null pointer errors during compilation and reduce the possibility of null pointer errors during runtime.

All types in Kotlin can be nullable, and only then can they have a null value assigned. Nullable types are declared with...

Casting

To cast from one type to another, Kotlin uses the as keyword. Here’s how you would cast Any type to an Int type:

fun casting(any: Any) {
    val num = any as Int
}

During runtime, before casting, the JVM will check if the source type can be cast to target type. If not, ClassCastException will be thrown.

Safe casting

There is also the safe casting operator, as?. This operator checks, before casting, whether or not types are compatible. If they are, then it works as a normal asoperator. If not, a null value is assigned. Notice how in this example, the local variable num has to be declared as a nullable type:

fun safeCasting(any: Any) {
    val num: Int? = any as? Int
}

Safe casts can be used with all other null...

Functions

Functions in Kotlin are declared with the fun keyword. Following the keyword comes the function name, then parentheses, which contain optional function parameters. In Kotlin, return type comes at the end of the function definition, after a colon.

Here's a function in Kotlin that adds two numbers and returns the result:

fun add(a: Int, b: Int): Int {
val result: Int = a + b 
return result
}

This function accepts two parameters of type Int (32-bit integer), has a local variable of type Int, and also returns an Int.

If you are familiar with Java, you might have noticed that types of parameters and local variables come after their name. In Java their type declaration comes first.

Calling this function would look like this:

val result: Int = add(1, 1)

In Java, every declaration, such as a field or a function, has to be inside a class. Kotlin doesn’t have such restrictions and will allow you to declare functions on a file level, outside of a class. To make it compatible with Java bytecode,...

Local variables

Local variables can be declared in two ways: first, with the val  keyword, then they are immutable (the variable cannot be reassigned). If you are coming from Java, val would be equal to variables declared with a final keyword.

Secondly, you can declare a local variable with a var keyword; then it is considered mutable and the value can be reassigned after a declaration.

The following command demonstrates that it will not compile, because the bar local variable cannot be reassigned:

fun immutable() {
val bar: String = "Kotlin"
bar = "Kotlin is awesome" // compiler error
}

And, when declared with var, the compiler allows a local variable to be reassigned:

fun mutable() {
var bar: String = "Kotlin"
bar = "Kotlin is awesome" 
}

You should favor immutable variables. The compiler will give you a warning if you use a mutable variable but only assign it once.

Whether you declare a variable as mutable or immutable, it has to have a value when it is declared, or, if it doesn’t have a value...

Local functions

Local functions are functions declared inside a function. They are also called nested functions. They are popular in scripting languages, but some other modern Object-Oriented languages, like Scala, Swift, and C# (since 7.0) also have them. One of the uses of local functions is code reuse. You can extract a piece of code that is repeated inside a local function so the code can be reused:

fun printUserDetails(user: User) {
fun tryPrint(str: String) {
if (str.length > 5) {
            println(str)
        } 
       else  {
println("I print strings with more than 5 characters")
       }
    }
    tryPrint(user.firstName)
tryPrint(user.lastName)
tryPrint(user.address)
}

You can see how the function tryPrint is declared inside the printUserDetails function.  We can call the nested function just as we would a normal function. The only difference between this and regular functions is the visibility. Local functions are only visible inside the function they were declared in. You...

Type inference

Declaring types in Kotlin is optional. This is a feature of a Kotlin compiler called Type inference. The compiler can infer the type from the context of the usage. Kotlin is a strongly and statically typed language, so omitting types doesn’t mean that you lose type safety. 

Here’s an example of type inference:

val str = "Kotlin"

str variable is of type String and the compiler knows this from the String literal that is initializing the variable. That’s why, if you try to assign a different type to this variable, you'll get a compiler error, as can be seen in the following:

var str = "Kotlin"
str = 1 // compiler error

Type inference doesn’t just work on local variables, but also on functions with expression bodies, generic types, closures and lambdas. You’ll see more type inference in practice in following chapters.

Basic types

If you are familiar with Java, then you probably know that Java has primitive (value) types and reference types.

The differences between them are that primitive type variables store the actual value of the type in their memory location (usually on the Stack) and reference type variables store the reference (memory address) to another memory location (on the Heap) where the actual data is stored.

Primitive types in Java also have their Boxed (Boxing is an automatic conversion of a primitive type to a reference type) version, a reference type. For example, a primitive int (32-bit integer) has a reference type in type Integer.

Kotlin doesn’t have this distinction between primitive and reference type. This doesn’t mean a Kotlin compiler cannot emit primitive types in Java bytecode. In fact, it would be really inefficient if Kotlin had only reference types.

Kotlin only hides this distinction from a developer. The compiler emits Java bytecode according to usage. In most cases, it will...

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Key benefits

  • Start programming with Kotlin
  • Explore Kotlin language syntax, standard libraries and Java Interoperability
  • Builds an example application with what you learn

Description

Kotlin is a general purpose, object-oriented language that primarily targets the JVM and Android. Intended as a better alternative to Java, its main goals are high interoperability with Java and increased developer productivity. Kotlin is still a new language and this book will help you to learn the core Kotlin features and get you ready for developing applications with Kotlin. This book covers Kotlin features in detail and explains them with practical code examples.You will learn how to set up the environment and take your frst steps with Kotlin and its syntax. We will cover the basics of the language, including functions, variables, and basic data types. With the basics covered, the next chapters show how functions are first-class citizens in Kotlin and deal with the object-oriented side of Kotlin. You will move on to more advanced features of Kotlin. You will explore Kotlin's Standard Library and learn how to work with the Collections API. The book finishes by putting Kotlin in to practice, showing how to build a desktop app. By the end of this book, you will be confident enough to use Kotlin for your next project.

Who is this book for?

This book is intended for anybody who wants to learn the most important Kotlin features. No experience of Kotlin is expected.

What you will learn

  • • Programming in Kotlin language syntax, basic types, control ?ow, classes, and OOP
  • • Writing functions and functional programming in Kotlin
  • • Defning and importing from packages in Kotlin
  • • Running Kotlin on JVMs and Android runtimes
  • • Working with the Kotlin Standard Library and advanced features of Kotlin programming
  • • Setting up a Kotlin development environment with JetBrains tools
  • • Building real-world applications with Kotlin
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Aug 31, 2018
Length: 178 pages
Edition : 1st
Language : English
ISBN-13 : 9781789344189
Category :
Programming
Languages :
Kotlin
Concepts :
Programming Language
Tools :
Android

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Product Details

Publication date : Aug 31, 2018
Length: 178 pages
Edition : 1st
Language : English
ISBN-13 : 9781789344189
Category :
Programming
Languages :
Kotlin
Concepts :
Programming Language
Tools :
Android

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Table of Contents

8 Chapters
Introducing Kotlin Chevron down icon Chevron up icon
Introducing Kotlin
Compiling and running Kotlin
Kotlin's uses
Java interoperability
Build tools
Setting up the development environment
Summary
Kotlin Basics Chevron down icon Chevron up icon
Kotlin Basics
Functions
Local variables
Local functions
Type inference
Basic types
Nullable types
Casting
Control flow
Exceptions
Packages
Visibility modifiers
Summary
Classes and Object-Oriented Programming Chevron down icon Chevron up icon
Classes and Object-Oriented Programming
Classes
Properties
Class constructors
Nested classes
Enum classes
Data classes
Inheritance
Overriding members
Abstract classes
Interfaces
Interfaces versus abstract classes
Object keyword
Class delegation
Sealed classes
Smart casts
Summary
Functions and Lambdas Chevron down icon Chevron up icon
Functions and Lambdas
Advanced functions
Lambdas
Function types
Summary
Advanced Kotlin Chevron down icon Chevron up icon
Advanced Kotlin
Generics
Concurrency constructs
Delegated properties
Extension functions
Extension properties
Receiver functions
Infix functions
Building a simple DSL
Operator overloading
Summary
Kotlin Standard Library Chevron down icon Chevron up icon
Kotlin Standard Library
Collections
Working with collections
Kotlin standard library functions
Summary
Coding a Dictionary App with Kotlin Chevron down icon Chevron up icon
Coding a Dictionary App with Kotlin
Project setup
Developing the dictionary app
Summary
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About the author

Profile icon Marko Devcic
Marko Devcic
Github icon
Marko Devcic is a Software Engineer currently working as an Android Developer for Austrian company mySugr in Vienna. He has a Master's degree in Engineering from University of Zagreb in Croatia. Over the years, he has worked with various technologies and languages, mostly C# and Java. He is passionate about technology and software development. He loves reading about programming languages and writing simple and clean code. In his spare time, he writes code for his personal projects, and contributes to open source projects. You can follow him on Github (username deva666). He also likes to write about Kotlin, C#, and programming in general on his web page ( http://www.markodevcic.com ).
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Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela