The logical NOT operator inverts a Boolean value. Here is a prototype:
varA = !varB
Here is a example:
var x = true var y = !x //y equals false
- Preface
- Taking the First Steps with Swift
- What is Swift?
- Playgrounds
- Getting started with Playgrounds
- iOS, tvOS, and macOS Playgrounds
- Showing images in a Playground
- Creating and displaying graphs in Playgrounds
- What Playgrounds are not
- Swift language syntax
- Comments
- Semicolons
- Parentheses
- Curly brackets
- An assignment operator does not return a value
- Spaces are optional in conditional and assignment statements
- Hello World
- Summary
- Learning about Variables, Constants, Strings, and Operators
- Using Swift Collections and the Tuple Type
- Swift collection types
- Mutability
- Arrays
- Creating and initializing arrays
- Accessing the array elements
- Counting the elements of an array
- Is the array empty?
- Appending to an array
- Inserting a value into an array
- Replacing elements in an array
- Removing elements from an array
- Merging two arrays
- Retrieving a subarray from an array
- Making bulk changes to an array
- Algorithms for arrays
- Iterating over an array
- Dictionaries
- Set
- Tuples
- Summary
- Control Flow and Functions
- Classes and Structures
- Using Protocols and Protocol Extensions
- Protocol-Oriented Design
- Writing Safer Code with Availability and Error Handling
- Custom Subscripting
- Using Optional Types
- Working with Generics
- Working with Closures
- Using Mix and Match
- What is mix and match?
- When to use mix and match
- Using Swift and Objective-C together in the same project
- Creating the project
- Adding Swift files to the Objective-C project
- The Objective-C bridging header file - part 1
- Adding the Objective-C file to the project
- The Messages Objective-C class
- The Objective-C bridging header file - part 2
- The MessageBuilder Swift class - accessing Objective-C code from Swift
- The Objective-C class - accessing Swift code from Objective-C
- Summary
- Concurrency and Parallelism in Swift
- Swift Formatting and Style Guide
- What is a programming style guide?
- Your style guide
- Do not use semicolons at the end of statements
- Do not use parentheses for conditional statements
- Naming
- Comments
- Using the self keyword
- Constants and variables
- Optional types
- Using type inference
- Using shorthand declaration for collections
- Using switch rather than multiple if statements
- Don't leave commented-out code in your application
- Summary
- Swift Core Libraries
- Adopting Design Patterns in Swift
The logical NOT operator
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