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Beginning Swift

Beginning Swift

By : Rob Kerr, Kåre Morstøl
4 (1)
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Beginning Swift

Beginning Swift

4 (1)
By: Rob Kerr, Kåre Morstøl

Overview of this book

Take your first foray into programming for Apple devices with Swift.Swift is fundamentally different from Objective-C, as it is a protocol-oriented language. While you can still write normal object-oriented code in Swift, it requires a new way of thinking to take advantage of its powerful features and a solid understanding of the basics to become productive.
Table of Contents (10 chapters)
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Beginning Swift
Beginning Swift
Contributors
Contributors
Preface
Preface
Free Chapter
1
Swift Basics
Swift Basics
Lesson objectives
Swift Program Structure
Swift Variables and Constants
Swift Data Types
Enums
Summary
2
Swift Operators and Control Flow
Swift Operators and Control Flow
Lesson objectives
Swift Operators
Branching
Loops
Summary
3
Functions, Classes, and Structs
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Functions, Classes, and Structs
Lesson Objectives
Functions
Error Handling
Object-Oriented Features
Summary
Challenge
4
Collections
Collections
Lesson Objectives
Arrays
Sets
Dictionaries
Summary
5
Strings
Strings
Lesson Objectives
String Fundamentals
Using Strings
Substring
Summary
6
Functional Programming and Lazy Operations
Functional Programming and Lazy Operations
Lesson Objectives
Function Type
Functional Methods
Lazy Operations
Swifty Code
Summary
Further Study
Challenge
Index
Index

Functions

In the program structure section in Lesson 1, we mentioned that functions are a key part of Swift's structure, and are units of code that can accept parameters and can return values. In this section, we'll dive into Swift functions, learning how to implement and call them in the course of a Swift application.

Before diving into Swift function syntax, we should summarize some key points about how functions are used in Swift, and in modern software development generally:

  • Functions are units of code that carry out some specific task.

  • In terms of lines of code, functions should be short. How many lines of code is a maximum for a function has been a topic of debate for decades. However, long functions often do not satisfy the specific task definition.

  • All things being equal, it's better to have a complex process broken into smaller functions, rather than combined into a large, complex function.

  • All things being equal, a function that references its parameters—but not global variables...

End of Section 3
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