variadic-functions.swift

import UIKit

class myClass {
    var myVal = 1
}

func addVals(myClasses: [myClass]) -> Int {
    var result = 0
    for thisClass in myClasses {
        result += thisClass.myVal
    }
    return result
}

func addValsVariadic(myClasses: myClass...) -> Int {
    var result = 0
    for thisClass in myClasses {
        result += thisClass.myVal
    }
    return result
}

let c1 = myClass()
c1.myVal = 2

let c2 = myClass()
c2.myVal = 3

addVals([c1, c2]) // returns 5

addValsVariadic(c1, c2) // also returns 5