Hani M K - Exploring Kotlin
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This book is for sale at http://leanpub.com/exploring-kotlin
This version was published on 2019-11-30
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This is a Leanpub book. Leanpub empowers authors and publishers with the Lean Publishing process. Lean Publishing is the act of publishing an in-progress ebook using lightweight tools and many iterations to get reader feedback, pivot until you have the right book and build traction once you do.
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Thank you for downloading Exploring Kotlin.
This book is dedicated for those who spent a good amount of their career writing Java! Finally, here is a language that makes you be yourself :)
The first version of this book, is a result of individual effort. Writing this mini book was a good way to explore Kotlin. I hope reading it does the same thing too.
Your comments and suggestions are welcome.
Please, feel free to contact and follow if you like.
- Email: hmkcode@gmail.com
- Github: github.com/hmkcode
- Twitter: twitter.com/hmkcode
- Blog: hmkcode.com
Hani M. K.
- This chapter will cover the basic syntax of Kotlin and will introduce some of the tools used for coding in Kotlin.
- There are many tools that will help you start coding in Kotlin.
- Tools listed below shall cover the needs for most Kotlin learners to start coding in Kotlin.
- Based on your goal from learning Kotlin, you may use one or more of these tools.
- In this book we will mainly be using Kotlin online playground.
- Kotlin Playground is an online sandbox to explore Kotlin.
- The playground is the easiest way to start exploring Kotlin.
1funmain(){2println("Hello, world!!!")3}- IntelliJ IDEA is the preferred IDE for developing projects in Kotlin.
- Kotlin is bundled with IntelliJ IDEA. It has all what you need to start coding in Kotlin.
- You can download the free Community Edition
- You can follow the steps in this tutorial from Kotlin official site Getting Started with IntelliJ IDEA
- Android Studio fully supports Kotlin.
- You can create a new project with Kotlin-first support, add Kotlin files to existing project with Java files or converting existing Java to Kotlin.
main() function- The starting point for running Kotlin app is
main()function.
1funmain(){2println("Hello world!")3}val & var variables- Read-only variables should be defined with
val - Variables that can be updated or changed is defined as
var - Variables must either have a type annotation or be initialized
1valw:Int=0// immediate assignment2valx=6// type `Int` is inferred "no type provided"3valy:Int// Type is required "no initial value"4y=7// deferred assignment "Type of y defined before"5valz=3// this is OK67z=z+1// This is an error "Val cannot be reassigned"89varcounter=0// this variable can be updated10counter++;- Comments can be added in Kotlin as following
1// single line comment23/* Multi-line4comments */- String template is a neat way to build a dynamic string.
1funmain(){2varn=13println("n = $n")4valresult="n is ${if(n > 0) "positive" else "notpositive"}"5println(result)6}Output:
1 n = 12 n is positive- Notice: Kotlin expression inside the curly brackets.
fun- Functions is a block of reusable code that is used to perform an action and may return result.
- Functions are declared using
funkeyword. - Functions may take variables or even other functions as parameters.
1funmultiply(a:Int,b:Int):Int{2returna*b3}- Function with expression body and inferred return type can be written as:
1funmultiply(a:Int,b:Int)=a*b- Function parameters can have default values.
1funmultiply(a:Int=2,b:Int=4)=a*b- Function with no return value use
Unitas return type which can be also omitted.
1funprintResult(a:Int,b:Int):Unit{23println("result = "+multiply(a,b))45}if & when Control Flowif
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