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Mastering Swift 5.3

You're reading from   Mastering Swift 5.3 Upgrade your knowledge and become an expert in the latest version of the Swift programming language

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Product type Paperback
Published in Nov 2020
Publisher Packt
ISBN-13 9781800562158
Length 418 pages
Edition 6th Edition
Languages
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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 (23) Chapters Close

Preface 1. Taking the First Steps with Swift 2. Swift Documentation and Installing Swift FREE CHAPTER 3. Learning about Variables, Constants, Strings, and Operators 4. Optional Types 5. Using Swift Collections 6. Control Flow 7. Functions 8. Classes, Structures, and Protocols 9. Protocols and Protocol Extensions 10. Protocol-Oriented Design 11. Generics 12. Error Handling and Availability 13. Custom Subscripting 14. Working with Closures 15. Advanced and Custom Operators 16. Concurrency and Parallelism in Swift 17. Custom Value Types 18. Memory Management 19. Swift Formatting and Style Guide 20. Adopting Design Patterns in Swift 21. Other Books You May Enjoy
22. Index

Returning multiple values from a function

There are a couple of ways to return multiple values from a Swift function. One of the most common ways is to put the values into a collection type (an array or dictionary) and then return the collection.

The following example shows how to return a collection type from a Swift function:

func getNames() -> [String] {
    var retArray = ["Jon", "Kailey", "Kara"]
    return retArray
}
var names = getNames()

In the preceding example, we declared the getNames() function with no parameters and a return type of [String]. The return type of [String] specifies the return type to be an array of string types.

In the preceding example, our array could only return string types. If we needed to return numbers with our strings, we could return an array of the Any type and then use typecasting to specify the object type. However, this would not be a good design for our application, as it would be prone to...

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