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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

Operators


Operators are functions that use a symbolic name. In Kotlin, many built-in operators are actually function calls. For example, array access is a real function:

    val array = arrayOf(1, 2, 3) 
    val element = array[0] 

In this example, the [0] operation is translated into a call to the function get(index: Int) defined on the Array class.

Many operators are predefined in Kotlin, just like they are in most other languages, and most operators tend to be combined with the infix style. This is immediately familiar in the guise of binary operators on numbers.

Note

Although Kotlin treats operations on basic types as functions, they are compiled to the appropriate byte code operations to avoid function overhead and ensure maximum performance.

Often operators are preferred over real names if the operators are already familiar to the users. In fields such as mathematics or physics, where operators are routinely used, it would be natural to also use operations in code where appropriate...

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