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Mastering Swift 3 - Linux

You're reading from   Mastering Swift 3 - Linux Learn to build fast and robust applications on the Linux platform with Swift

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Product type Paperback
Published in Jan 2017
Publisher Packt
ISBN-13 9781786461414
Length 380 pages
Edition 1st Edition
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Author (1):
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Jon Hoffman Jon Hoffman
Author Profile Icon Jon Hoffman
Jon Hoffman
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Table of Contents (24) Chapters Close

Mastering Swift 3 - Linux
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. Taking the First Steps with Swift FREE CHAPTER 2. Learning About Variables, Constants, Strings, and Operators 3. Using Swift Collections and the Tuple Type 4. Control Flow and Functions 5. Classes and Structures 6. Using Protocols and Protocol Extensions 7. Protocol-Oriented Design 8. Writing Safer Code with Error Handling 9. Custom Subscripting 10. Using Optional Types 11. Working with Generics 12. Working with Closures 13. Using C Libraries with Swift 14. Concurrency and Parallelism in Swift 15. Swifts Core Libraries 16. Swift on Single Board Computers 17. Swift Formatting and Style Guide 18. Adopting Design Patterns in Swift

Introducing subscripts


Subscripts, in the Swift language, are used as shortcuts for accessing elements of a collection, list, or sequence. We can use them in our custom types to set or retrieve the values by index rather than using getter and setter methods. Subscripts, if used correctly, can significantly enhance the usability and readability of our custom types.

We can define multiple subscripts for a single type. When a type has multiple subscripts, the appropriate subscript will be chosen, based on the type of index passed into the subscript. We can also set external parameter names for our subscripts, which can help distinguish between subscripts that have the same type.

We use custom subscripts just like we use subscripts for arrays and dictionaries. For example, to access an element in an array, we will use the anArray[index] syntax, and to access an element of a dictionary, we will use the same syntax aDictionary[key]. When we define a custom subscript for our custom types, we also...

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