Static struct properties in Swift

Static.swift

struct Vehicle {
    // Here are four struct properties: Three are
    // required when I initialize an instance, and
    // the fourth is computed
    var name: String
    let consumptionInLper100km: Float
    let fuelCapacityInL: Float
    var autonomy: Float {
        return fuelCapacityInL * (100/consumptionInLper100km);
    }
    
    // This is static, and won't be an instance property
    static func calculateAutonomy (consumptionInLper100km: Float, fuelCapacityInL: Float) -> Float {
        return fuelCapacityInL * (100/consumptionInLper100km);
    }
}

// Let's try this out! I create a Yaris instance

let Yaris = Vehicle(
    name: "Toyota Yaris",
    consumptionInLper100km: 6.72,
    fuelCapacityInL: 44
)
print(Yaris.autonomy) // 654.7 kilometers. Cool!

// But if I try to use .calculateAutonomy on my instance:
Yaris.calculateAutonomy(...)
// Nope! Huh.
// Error: Static member 'calculateAutonomy' cannot be
// used on instance of type 'Vehicle'

// This is a property of the vehicle struct itself.
// So I call it straight from the struct/class without
// creating a specific instance.

//It can be handy in a lot of situations.
// Let's say I need nothing else than to
// calculate something's autonomy once:

let ducatiScramblerAutonomy = Vehicle.calculateAutonomy(
    consumptionInLper100km: 5.4,
    fuelCapacityInL: 13.5
)

print(ducatiScramblerAutonomy) // 250 kilometers!