Swift: Random number for 64-bit integers?

Question

So, with my current project, I need to work with 64-bit integers and I need to grab random numbers between ranges up to 100 billion. arc4random()/arc4random_uniform() only w

Answer 1

Here is one neat solution! (methinks anyway, since I just made it up)

let hex = UUID().uuidString.components(separatedBy: "-").suffix(2).joined()
let rand = UInt64(hex, radix: 0x10)

Quick test with Swift REPL:

https://repl.it/GeIs/0

for _ in 0..<5_000_000 {
    let hex = UUID().uuidString.components(separatedBy: "-").suffix(2).joined()
    set.insert(UInt64(hex, radix: 0x10)!)
}
set.count // prints 5_000_000

As an extension...

import Foundation


extension UInt64 {

    static var random: UInt64 {

        let hex = UUID().uuidString
            .components(separatedBy: "-")
            .suffix(2)
            .joined()

        return UInt64(hex, radix: 0x10)!
    }
}