Self Vs. self

self-current-instance.swift

struct LegoCar {
    var color: UIColor
    var wheels: Int
    
    mutating func addNewWheels(wheels: Int) {
        self.wheels = wheels // Using 'self' to refer to this specific Lego car
    }
}

var newCar = LegoCar(color: .blue, wheels: 2)
newCar.addNewWheels(wheels: 4)

Self-type-identity.swift

struct LegoCar {
    static var defaultColour: UIColor = .red
    static var defaultWheels = 4

    var colour: UIColor
    var wheels: Int

    static func create() -> Self {
        return self.init(colour: defaultColour, wheels: defaultWheels)
    }
}

let newBuild = LegoCar.create()