In Swift, Booleans are a type that can represent one of two values: true or false. They are used to represent logical conditions, such as whether a value is greater than or equal to another value, or whether a string contains a certain substring.
Booleans can be declared using the `Bool` keyword, and they can be initialized with the literal values `true` or `false`. For example:
var isAuthenticated = true
Booleans can also be initialized with the result of a Boolean expression. For example:
var isEven = (number % 2) == 0
Booleans can be used in conditional statements, such as `if` statements and `switch` statements. For example
if isAuthenticated {
// The user is authenticated, so do something
} else {
// The user is not authenticated, so do something else
}
Booleans can also be used in logical operators, such as `&&` (and), `||` (or), and `!` (not). For example:
var isAdmin = true
var isLoggedIn = true
if isAdmin && isLoggedIn {
// The user is an admin and is logged in, so do something
}
Booleans are a powerful tool that can be used to represent logical conditions and to control the flow of your code.
Here are some additional things to know about Booleans in Swift:
- Booleans are immutable, which means that their values cannot be changed once they are set.
- Booleans can be implicitly converted to integers, with `true` being converted to 1 and `false` being converted to 0.
- Booleans can be used as the types of function parameters and return values.
