Why does a function call require the parameter name in Swift?

Question

I have this Function in a class:

func multiply(factor1:Int, factor2:Int) -> Int{
    return factor1 * factor2
}

I try to call the functi

Answer 1

A note about passing in a method as an argument that returns no value:

func refresh(obj:Obj, _ method: (Obj)->Void = setValue) {
    method(element)
}
func setValue(obj:Obj){
    obj.value = "someValue"
}
refresh(someObj,setValue)