Browse Library
Sign In Start Free Trial
Close icon Search icon
Account
Browse Library Advanced Search Sign In Start Free Trial

Add to playlist

Create a Playlist

Modal Close icon
You need to login to use this feature.
  • Beginning Swift
  • Toc
  • feedback
Beginning Swift

Beginning Swift

By : Rob Kerr, Kåre Morstøl
4 (1)
close
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)
close
close
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
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
chevron up
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

String Fundamentals

Before we get into how to use strings, we will cover why they are the way they are. Because for developers coming from other languages, this is a very reasonable question to ask.

Character

We won't go into the details of Unicode, but there are several ways of viewing a piece of Unicode text in Swift. This is done by using different collections:

let string = "The ☀ and 🌙"
string.utf8.count // 19
string.utf16.count // 13
string.unicodeScalars.count // 12

Note

An element of UTF-8 is 1 byte, UTF-16 is 2 bytes, and a Unicode scalar is 4 bytes.

In addition to everyone reporting a different number of symbols in the string, you may have also noticed that they are all wrong. String itself, however, has the right answer:

string.count // 11

This is because String is an ordered collection of Character. Character represents what we humans would consider one symbol, regardless of how many bytes it consists of.

The reason for the discrepancies is, of course, the two emojis: ...

End of Section 3
Next Section
bookmark search playlist font-size

Change the font size

margin-width

Change margin width

day-mode

Change background colour

Close icon Search
Country selected
Close icon Your notes and bookmarks

Delete Bookmark

Modal Close icon
Are you sure you want to delete it?
Cancel
Yes, Delete