Difficulties to assign default value to a parameter of a function

Question

In a class, I defined a private constant, I try to use the constant as a default value of parameter of a function:

class Foo {
  // instance variable
  priva         


        

Answer 1

How about a top-level variable?

fileprivate let DefaultValue = 10

class Foo {
    public func doTask(amount: Int = DefaultValue) {
        ...
    }
}