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Beginning Swift
Beginning Swift

Beginning Swift: Master the fundamentals of programming in Swift 4

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Profile Icon Rob Kerr Profile Icon Kåre Morstøl
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Paperback May 2018 202 pages 1st Edition
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Arrow left icon
Profile Icon Rob Kerr Profile Icon Kåre Morstøl
Arrow right icon
$26.99
Full star icon Full star icon Full star icon Full star icon Empty star icon 4 (1 Ratings)
Paperback May 2018 202 pages 1st Edition
eBook
$14.99 $21.99
Paperback
$26.99
Subscription
Free Trial
Renews at $19.99p/m
eBook
$14.99 $21.99
Paperback
$26.99
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Renews at $19.99p/m

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Beginning Swift

Chapter 2. Swift Operators and Control Flow

In the last lesson, you learned the fundamentals of Swift syntax, data types, and how to use variables to store and operate on data in a Swift program.

In this lesson, you'll learn how to use the fundamental flow control structures and language elements that form the building blocks for Swift programs.

Swift contains a full set of flow control constructions that help you build logic and organize applications. Swift implements control structures you'll find familiar, and Swift adds modern features and extensions not available in some other languages.

This lesson also covers the broad range of Swift logical and bitwise operators. Swift supports a comprehensive set of operators, based on the C operator construction—but with modern extensions that we'll fully cover in this lesson.

Lesson objectives


By the end of this lesson, you will be able to do the following:

  • Use the assignment, arithmetic, and bitwise operators

  • Use Swift's comparison operators

  • Explain the functionality of Swift's range operators

  • Use the Swift branching features: if and switch

  • Control program flow with loops, such as for, while, and repeat/while

Swift Operators


Operators are special characters—usually drawn from mathematics—that are used to process evaluations, modify variable values, and combine values. Swift operators break down into categories by the function they perform:

  • Assignment operators

  • Arithmetic operators

  • Comparison operators

  • Logical operators

  • Bitwise operators

  • Nil-coalescing operators

  • Range operators

Refer to the following diagram:

Swift implements its assignment, arithmetic, comparison, logical, and bitwise operators nearly identically to other C-inspired languages, such as C++, Java, and C#—so your previous experience with these operators will apply directly to Swift programming.

In this lesson, we'll summarize this common set of operators, and only highlight unique Swift implementations. Should you need detailed information on the meaning of any of these operators, please refer to Apple's The Swift Programming Language guide ( https://developer.apple.com/library/content/documentation/Swift/Conceptual...

Branching


Flow control structures enable developers to apply logical processes and make decisions about what code is executed. Most modern programming languages provide a similar set of flow control structures:

  • The if statements execute code blocks when a Boolean condition is true.

  • The while loops execute blocks of code while a Boolean condition remains true.

  • The for loops execute blocks of code a specific number of times.

It's said that virtually any programming control flow requirement can be implemented with a while statement alone. However, the other various control structures allow programmers to create control flow that's more concise and clearly expresses the intent of the logical program flow.

Indeed, Swift provides a rich and powerful set of control structures, which you'll learn about in this section.

The if Statement

The most basic flow control statement in programming is the if statement, which executes a block of code if some Boolean expression...

Loops


After the branching structures if and switch, the most common structures you'll use in your programming are looping structures, which cause your program flow to execute the same code iteratively.

The looping structures you'll learn in this section are the following:

  • for…in, which executes the same code a predetermined number of times

  • while and repeat…while, which executes code until a true condition becomes false

As with the switch control structure, there are many features and flexible options provided by these structures that make Swift more expressive and powerful than many other programming languages.

The for…in Statement

The following diagram illustrates how the for...in statement works:

Most programming languages have a for statement used to execute a code statement a certain number of times. The preceding diagram illustrates how the for...in statement works. A canonical example of a for loop in C, similar to many other C-inspired languages, is the following: ...

Summary


In this lesson, you've learned how to use Swift's key language:

  • Assignment, arithmetic, and bitwise operators

  • Comparison and range operators

  • The Swift branching features: if and switch

  • Loops: for, while, repeat…while

You now have the skills needed to develop robust applications using Swift's powerful and expressive language syntax. In the next lesson, you'll learn the skills to develop functions and classes to organize your code. You will also explore and use error handling to efficiently handle unexpected errors in your programs.

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Key benefits

  • Teaches you how to correctly structure and architect software using Swift
  • Uses real-world examples to connect the theory to a professional setting
  • Imparts expertise in the core Swift standard library

Description

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.

Who is this book for?

If you are seeking fundamental Swift programming skills, in preparation for learning to develop native applications for iOS or macOS, this book is the best for you. You don’t need to have any prior Swift knowledge; however, object-oriented programming experience is desired.

What you will learn

  • Explore the fundamental Swift programming concepts, language structure, and the Swift programming syntax
  • Learn how Swift compares to other computer languages and how to transform your thinking to leverage new concepts such as optionals and protocols
  • Master how to use key language elements, such as strings and collections
  • Grasp how Swift supports modern application development using advanced features, such as built-in Unicode support and higher-order functions
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Publication date, Length, Edition, Language, ISBN-13
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Length: 202 pages
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Language : English
ISBN-13 : 9781789534313
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Product Details

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Length: 202 pages
Edition : 1st
Language : English
ISBN-13 : 9781789534313
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Table of Contents

6 Chapters
Swift Basics Chevron down icon Chevron up icon
Swift Operators and Control Flow Chevron down icon Chevron up icon
Functions, Classes, and Structs Chevron down icon Chevron up icon
Collections Chevron down icon Chevron up icon
Strings Chevron down icon Chevron up icon
Functional Programming and Lazy Operations Chevron down icon Chevron up icon

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