How to generate a random number in a range (10...20) using Swift [duplicate]

Question

I'm able to pick a random number for my items in my game but is it possible to pick a random number between 2 numbers?

so instead of

let number = (arc4random_uniform(100))

I would like something like this:

let number = (arc4random_uniform(10...20))

or something like that? Now if I get a weapon drop it can be everything in my list. This way I could make it so that only the first few would have a drop for a specific monster or at higher level they would drop better weapons and not the low levels anymore.

Answer 1

Xcode 11 • Swift 5.1 or later

extension Range where Bound: FixedWidthInteger {
    var random: Bound { .random(in: self) }
    func random(_ n: Int) -> [Bound] { (0..<n).map { _ in random } }
}

---

extension ClosedRange where Bound: FixedWidthInteger  {
    var random: Bound { .random(in: self) }
    func random(_ n: Int) -> [Bound] { (0..<n).map { _ in random } }
}

Note: For older Swift versions check the edit history

Usage:

(10...20).random    // 16
(0...1).random(10)  // [0, 1, 0, 0, 1, 1, 1, 1, 1, 0]