How does adding instances to a Array work in Swift?-CodePudding

I am following along a tutorial and I am confused with why there are () at the end of the array which will hold instances of Car.

class CarModel {
    
    var cars = [Car]()
    
    init () {
       ... 
    }
    
}

Can someone explain how this is working.

CodePudding user response：

Most initialisers can be used without typing the .init name. So let someObject = SomeType() would be the same as let someObject = SomeType.init().

Array has an empty initialiser that will create an empty array.

// let emptyCarArray = Array<Car>.init()
let emptyCarArray = Array<Car>()

However, Swift also has a syntax shortcut for Array<Element> which is [Element]. So the above code is exactly the same as doing...

// let emptyCarArray = [Car].init()
let emptyCarArray = [Car]()

This can also be done by explicitly setting the type too...

let emptyCarArray: Array<Car> = []
let emptyCarArray: [Car] = []

All four lines of code in this do the same thing.