Nil-coalescing operator (??)
The nil-coalescing operator is a shorthand alternative to if let-else.
Example if let-else
func greet(name: String?) {
if let unwrappedName = name {
print("Hello \(unwrappedName)!")
} else {
print("Hello guest!")
}
}
greet(name: "Asma") // Hello Asma!
greet(name: nil) // Hello guest!
Nil-coalescing equivalent
func greet(name: String?) {
let unwrappedName = name ?? "guest"
print("Hello \(unwrappedName)!")
}
greet(name: "Asma") // Hello Asma!
greet(name: nil) // Hello guest!
