How to forward functions with variadic parameters?

Question

In Swift, how do you convert an Array to a Tuple?

The issue came up because I am trying to call a function that takes a variable number of arguments inside a funct

Answer 1

As of Swift 4.1 (in Xcode 9.2), there is no need to overload with sumOf(_ numbers: Int...), the function that forward variadic parameter(s) will IMPLICITLY change it to a single parameter of array of individual parameter(s). E.g. the following code will work without the overloading:

// This function does the actual work
func sumOf(_ numbers: [Int]) -> Int {
    return numbers.reduce(0, +) // functional style with reduce
}

func averageOf(_ numbers: Int...) -> Int {
    // This calls the first function directly
    return sumOf(numbers) / numbers.count
}

print(averageOf(2, 5, 1))

Don't know whether this is a bug of the compiler or not :)