There's no Swift submission option, but I wanted to see try this in Swift, so here it is:

```
import Foundation
class Solution {
let nums: [Int]
let numSize: Int
init(_ nums: [Int], _ numSize: Int) {
self.nums = nums
self.numSize = numSize
}
func pick(_ target: Int) -> Int {
// want to upper bound at O(n)
// return first of iteration or
// random index match
// this guarantees we won't have infinite
// execution
for i in 0..<numSize {
// unruly but unavoidable random syntax
let idx = Int(arc4random_uniform((UInt32)(numSize - i))) + i
if nums[idx] == target {
return idx
}
if nums[i] == target {
return i
}
}
return 0
}
}
```

Test:

```
print(Solution([1,2,3,3,3], 5).pick(3))
```