CodeWithSwift

A typealias is used to provide an alternative name for an existing type. It helps improve code readability, especially when working with complex or verbose types. It does not create a new type; it only creates a new name for an existing type.

typealias NewName = ExistingType

typealias Age = Int

func printAge(_ age: Age) {
    print("Your age is \(age).")
}

// Example usage
printAge(25) // Output: Your age is 25.

protocol Drivable {
    func drive()
}

protocol Fuelable {
    func refuel()
}

typealias Vehicle = Drivable & Fuelable

class Car: Vehicle {
    func drive() {
        print("Driving the car")
    }

    func refuel() {
        print("Refueling the car")
    }
}

// Example usage
func operate(vehicle: Vehicle) {
    vehicle.drive()
    vehicle.refuel()
}

let myCar = Car()
operate(vehicle: myCar)
// Output:
// Driving the car
// Refueling the car