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Kotlin Standard Library Cookbook

You're reading from   Kotlin Standard Library Cookbook Master the powerful Kotlin standard library through practical code examples

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Product type Paperback
Published in Jul 2018
Publisher Packt
ISBN-13 9781788837668
Length 242 pages
Edition 1st Edition
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Author (1):
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Samuel Urbanowicz Samuel Urbanowicz
Author Profile Icon Samuel Urbanowicz
Samuel Urbanowicz
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Table of Contents (11) Chapters Close

Preface 1. Ranges, Progressions, and Sequences 2. Expressive Functions and Adjustable Interfaces FREE CHAPTER 3. Shaping Code with Kotlin Functional Programming Features 4. Powerful Data Processing 5. Tasteful Design Patterns Adopting Kotlin Concepts 6. Friendly I/O Operations 7. Making Asynchronous Programming Great Again 8. Best Practices for the Android, JUnit, and JVM UI Frameworks 9. Miscellaneous 10. Other Books You May Enjoy

Declaring adjustable functions with default parameters

When creating new functions, we often need to allow some of their parameters to be optional. This forces us to use method overloading to create multiple function declarations with the same name but different sets of arguments related to different use cases and scenarios. Usually, under the hood, each variant of the function is calling the base function with the default implementation. Let's consider a simple example of a function that calculates a displacement of an object moving with a constant acceleration rate:

fun calculateDisplacement(initialSpeed: Float, 
acceleration: Float,
duration: Long): Double =
initialSpeed * duration + 0.5 * acceleration * duration * duration

We might also need to provide a displacement calculation for the scenario where the initial speed...

You have been reading a chapter from
Kotlin Standard Library Cookbook
Published in: Jul 2018
Publisher: Packt
ISBN-13: 9781788837668
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