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Programming Kotlin

You're reading from   Programming Kotlin Get to grips quickly with the best Java alternative

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Product type Paperback
Published in Jan 2017
Publisher Packt
ISBN-13 9781787126367
Length 420 pages
Edition 1st Edition
Languages
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Authors (2):
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Stefan Bocutiu Stefan Bocutiu
Author Profile Icon Stefan Bocutiu
Stefan Bocutiu
Stephen Samuel Stephen Samuel
Author Profile Icon Stephen Samuel
Stephen Samuel
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Toc

Table of Contents (14) Chapters Close

Preface 1. Getting Started with Kotlin FREE CHAPTER 2. Kotlin Basics 3. Object-Oriented Programming in Kotlin 4. Functions in Kotlin 5. Higher Order Functions and Functional Programming 6. Properties 7. Null Safety, Reflection, and Annotations 8. Generics 9. Data Classes 10. Collections 11. Testing in Kotlin 12. Microservices with Kotlin 13. Concurrency

Member functions


The first type of functions is called member functions. These functions are defined inside a class, object, or interface. A member function is invoked using the name of the containing class or object instance with a dot, followed by the function name and the arguments in parentheses. For example, to invoke a function called take on an instance of a string, we do the following:

    val string = "hello" 
    val length = string.take(5) 

Member functions can refer to themselves and they don't need the instance name to do this. This is because function invocations operate on the current instance, and they are referred to as the following:

    object Rectangle { 
 
      fun printArea(width: Int, height: Int): Unit { 
        val area = calculateArea(width, height) 
        println("The area is $area") 
      } 
 
      fun calculateArea(width: Int, height: Int): Int { 
        return width * height 
      } 
    } 
...
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