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Android Development with Kotlin

You're reading from  Android Development with Kotlin

Product type Book
Published in Aug 2017
Publisher Packt
ISBN-13 9781787123687
Pages 440 pages
Edition 1st Edition
Languages
Authors (2):
Igor Wojda Igor Wojda
Profile icon Igor Wojda
Marcin Moskala Marcin Moskala
Profile icon Marcin Moskala
View More author details
Toc

Table of Contents (16) Chapters close

Title Page
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface
1. Beginning Your Kotlin Adventure 2. Laying a Foundation 3. Playing with Functions 4. Classes and Objects 5. Functions as First-Class Citizens 6. Generics Are Your Friends 7. Extension Functions and Properties 8. Delegates 9. Making Your Marvel Gallery Application

Inline functions


Higher-order functions are very helpful and they can really improve the reusability of code. However, one of the biggest concerns about using them is efficiency. Lambda expressions are compiled to classes (often anonymous classes), and object creation in Java is a heavy operation. We can still use higher-order functions in an effective way, while keeping all the benefits, by making functions inline.

The concept of inline functions is pretty old, and it is mostly related to C++ or C. When a function is marked as inline, during code compilation the compiler will replace all the function calls with the actual body of the function. Also, lambda expressions provided as arguments are replaced with their actual body. They will not be treated as functions, but as actual code. This makes bytecode longer, but runtime execution is much more efficient. Later, we will see that nearly all higher-order functions from the standard library are marked as inline. Let's look at the example....

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