Browse Library
Sign In Start Free Trial
Close icon Search icon
Account
Browse Library Advanced Search Sign In Start Free Trial

Add to playlist

Create a Playlist

Modal Close icon
You need to login to use this feature.
  • Book Overview & Buying Programming Kotlin
  • Table Of Contents Toc
  • Feedback & Rating feedback
Programming Kotlin

Programming Kotlin

By : Samuel, Bocutiu
3.4 (7)
Buy this Book
close
close
Programming Kotlin

Programming Kotlin

3.4 (7)
By: Samuel, Bocutiu
Buy this Book

Overview of this book

Quickly learn the fundamentals of the Kotlin language and see it in action on the web. Easy to follow and covering the full set of programming features, this book will get you fluent in Kotlin for Android.
Table of Contents (14 chapters)
close
close
close
Preface
Icon
Preface
Icon
What this book covers
Icon
What you need for this book
Icon
Who this book is for
Icon
Conventions
Icon
Reader feedback
Icon
Customer support
Free Chapter
1
1. Getting Started with Kotlin
Icon
1. Getting Started with Kotlin
Icon
Using the command line to compile and run Kotlin code
Icon
Kotlin runtime
Icon
The REPL
Icon
Kotlin for scripting
Icon
Kotlin with Gradle
Icon
Kotlin with Maven
Icon
IntelliJ and Kotlin
Icon
Eclipse and Kotlin
Icon
Mixing Kotlin and Java in a project
Icon
Summary
2
2. Kotlin Basics
chevron up
Icon
2. Kotlin Basics
Icon
Vals and vars
Icon
Type inference
Icon
Basic types
Icon
Comments
Icon
Packages
Icon
Imports
Icon
String templates
Icon
Ranges
Icon
Loops
Icon
Exception handling
Icon
Instantiating classes
Icon
Referential equality and structural equality
Icon
This expression
Icon
Visibility modifiers
Icon
Control flow as expressions
Icon
Null syntax
Icon
When expression
Icon
Type hierarchy
Icon
Summary
3
3. Object-Oriented Programming in Kotlin
Icon
3. Object-Oriented Programming in Kotlin
Icon
Classes
Icon
Interfaces
Icon
Inheritance
Icon
Visibility modifiers
Icon
Abstract classes
Icon
Interface or abstract class
Icon
Polymorphism
Icon
Overriding rules
Icon
Inheritance versus composition
Icon
Class delegation
Icon
Sealed classes
Icon
Summary
4
4. Functions in Kotlin
Icon
4. Functions in Kotlin
Icon
Defining functions
Icon
Single expression functions
Icon
Member functions
Icon
Local functions
Icon
Top-level functions
Icon
Named parameters
Icon
Default parameters
Icon
Extension functions
Icon
Operators
Icon
Function literals
Icon
Tail recursive functions
Icon
Varargs
Icon
Standard library functions
Icon
Generic functions
Icon
Pure functions
Icon
Java from Kotlin
Icon
Kotlin from Java
Icon
Summary
5
5. Higher Order Functions and Functional Programming
Icon
5. Higher Order Functions and Functional Programming
Icon
Higher order functions
Icon
Closures
Icon
Anonymous functions
Icon
Function references
Icon
Function-literal receivers
Icon
Functions in the JVM
Icon
Function composition
Icon
Inline functions
Icon
Currying and partial application
Icon
Memoization
Icon
Type alias
Icon
Either
Icon
Custom DSLs
Icon
Validation and error accumulation
Icon
Summary
6
6. Properties
Icon
6. Properties
Icon
Why use properties?
Icon
Syntax and variations
Icon
Visibility
Icon
Late initialization
Icon
Delegated properties
Icon
Lazy initializations
Icon
Lateinit versus lazy
Icon
Observables
Icon
A non-null property delegate
Icon
Properties or methods?
Icon
Summary
7
7. Null Safety, Reflection, and Annotations
Icon
7. Null Safety, Reflection, and Annotations
Icon
Nullable types
Icon
Smart cast
Icon
Safe null access
Icon
Elvis operator
Icon
Safe casting
Icon
Optionals
Icon
Reflection
Icon
Constructors
Icon
Objects and companions
Icon
Useful KClass properties
Icon
Reflective functions and properties
Icon
Annotations
Icon
Standard annotations
Icon
Runtime annotation discovery
Icon
Summary
8
8. Generics
Icon
8. Generics
Icon
Parameterised functions
Icon
Parameterized types
Icon
Bounded polymorphism
Icon
Type variance
Icon
Nothing type
Icon
Type projection
Icon
Type erasure
Icon
Type reification
Icon
Recursive type bounds
Icon
Algebraic data types
Icon
Summary
9
9. Data Classes
Icon
9. Data Classes
Icon
Automatic creation of getters and setters
Icon
The copy method
Icon
toString out of the box
Icon
hashCode and equals methods generated for you
Icon
Destructed declarations
Icon
Destructing types
Icon
Data class definition rules
Icon
Limitations
Icon
Summary
10
10. Collections
Icon
10. Collections
Icon
Class hierarchy
Icon
Arrays
Icon
Lists
Icon
Maps
Icon
Sets
Icon
Read-only views
Icon
Indexed access
Icon
Sequences
Icon
Summary
11
11. Testing in Kotlin
Icon
11. Testing in Kotlin
Icon
Getting started
Icon
Choosing a spec
Icon
Matchers
Icon
Inspectors
Icon
Interceptors
Icon
Project config
Icon
Property testing
Icon
Table-driven testing
Icon
Tags, conditions, and config
Icon
Summary
12
12. Microservices with Kotlin
Icon
12. Microservices with Kotlin
Icon
Definition
Icon
Drawbacks
Icon
Why microservices?
Icon
Lagom
Icon
Defining services
Icon
Implementing a Lagom service
Icon
Summary
13
13. Concurrency
Icon
13. Concurrency
Icon
Threads
Icon
Deadlocks and livelocks
Icon
Executors
Icon
Race conditions
Icon
Summary

This expression

When inside a class or function, we often want to refer to the enclosing instance. For example, an instance may want to invoke a method passing itself as an argument. To do this, we use the keyword this:

    class Person(name: String) {
      fun printMe() = println(this) 
    }

In Kotlin terminology, the reference referred to by the this keyword is called the current receiver. This is because it was the instance that received the invocation of the function. For example, if we have a string and invoke length, the string instance is the receiver.

In members of a class, this refers to the class instance. In extension functions, this refers to the instance that the extension function was applied to.

Scope

In nested scopes, we may wish to refer to an outer instance. To do that, we must qualify the usage of this, and we do that using labels. The label we use is typically the name of the outer class, but there are more complicated rules for functions and closures discussed...

Unlock full access

Continue reading for free

A Packt free trial gives you instant online access to our library of over 7000 practical eBooks and videos, constantly updated with the latest in tech
Start a 7-day FREE trial
End of Section 18
Next Section

Create a Note

Modal Close icon
You need to login to use this feature.
notes
bookmark search playlist download
font-size

Change the font size

margin-width

Change margin width

day-mode

Change background colour

Close icon Search
Country selected
Close icon Your notes and bookmarks

Delete Bookmark

Modal Close icon
Are you sure you want to delete it?
Cancel
Yes, Delete

Delete Note

Modal Close icon
Are you sure you want to delete it?
Cancel
Yes, Delete

Edit Note

Modal Close icon
Write a note (max 255 characters)
Cancel
Update Note

Confirmation

Modal Close icon
claim successful
Order Page Read Now

Buy this book with your credits?

Modal Close icon
Are you sure you want to buy this book with one of your credits?
Close
YES, BUY