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Swift Functional Programming

You're reading from   Swift Functional Programming Ease the creation, testing, and maintenance of Swift codes

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Product type Paperback
Published in Apr 2017
Publisher Packt
ISBN-13 9781787284500
Length 316 pages
Edition 2nd Edition
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Author (1):
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Dr. Fatih Nayebi Dr. Fatih Nayebi
Author Profile Icon Dr. Fatih Nayebi
Dr. Fatih Nayebi
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Table of Contents (12) Chapters Close

Preface 1. Getting Started with Functional Programming in Swift FREE CHAPTER 2. Functions and Closures 3. Types and Type Casting 4. Enumerations and Pattern Matching 5. Generics and Associated Type Protocols 6. Map, Filter, and Reduce 7. Dealing with Optionals 8. Functional Data Structures 9. Importance of Immutability 10. Best of Both Worlds and Combining FP Paradigms with OOP 11. Case Study - Developing an iOS Application with FP and OOP Paradigms

Implicitly-unwrapped optionals


We can define implicitly-unwrapped Optionals by appending an exclamation mark (!) to the end of the type. These types of Optionals will unwrap themselves.

The following example presents two ways to get a value from a dictionary. In the first example, the resulting value will be an optional so should be unwrapped. The second example will implicitly unwrap the value:

Like forcefully unwrapping, implicitly-unwrapped Optionals may cause runtime crashes in our applications, so we need to be cautious when we use them.

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