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Swift 4 Programming Cookbook

You're reading from   Swift 4 Programming Cookbook 50 task-oriented recipes to maximise Swift 4 productivity

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Product type Paperback
Published in Sep 2017
Publisher Packt
ISBN-13 9781786460899
Length 384 pages
Edition 1st Edition
Languages
Tools
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Author (1):
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Keith Moon Keith Moon
Author Profile Icon Keith Moon
Keith Moon
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Toc

Table of Contents (9) Chapters Close

Preface 1. Swift Building Blocks FREE CHAPTER 2. Building on the Building Blocks 3. Data Wrangling with Swift Control Flow 4. Generics, Operators, and Nested Types 5. Beyond the Standard Library 6. Swift Playgrounds 7. Server-Side Swift 8. Performance and Responsiveness in Swift

Extending functionality with extensions

Extensions let us add functionalities to the existing classes, structs, enums, and protocols. This can be especially useful when the original type is provided by an external framework, and therefore you aren't able to add a functionality directly.

Getting ready

Imagine that we often need to obtain the first word from a given string. Rather than repeatedly writing the code to split the string into words and then retrieving the first word, we can extend the functionality of String to provide its own first word.

How to do it...

...
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