In Swift, you can check if a value is null or not by using the optional binding syntax. Here's an example:
// Optional variable
var optionalValue: Int? = 5
// Check if optionalValue is not null
if let value = optionalValue {
print("optionalValue is not null. Its value is \(value)")
} else {
print("optionalValue is null")
}
In this example, the optionalValue variable is declared as an optional type using the question mark ?. The if let statement checks if its value is not null and assigns it to the value constant. If the value is null, the else block is executed.
To check if a boolean value is true or false, you can use the if statement. Here's an example:
// Boolean variable
let isEven = true
// Check if the boolean value is true
if isEven {
print("The boolean value is true")
} else {
print("The boolean value is false")
}
In this example, the if statement checks if the isEven boolean value is true. If it is, the first block of code is executed. If it's false, the second block is executed.