Swift make method parameter mutable?

Question

How can I deal with this error without creating additional variable?

func reduceToZero(x:Int) -> Int {
    while (x != 0) {
        x = x-1            //         


        

Answer 1

Swift3 answer for passing mutable array pointer.

Function:

func foo(array: inout Array<Int>) {
    array.append(1)
}

Call to function:

var a = Array<Int>()
foo(array:&a)