GKRandomDistribution vs GKShuffledDistribution

random.swift

import Cocoa
import GameplayKit

let randoms = NSCountedSet()
let shuffles = NSCountedSet()
let gausians = NSCountedSet()

let randomD3 = GKRandomDistribution(lowestValue: 1, highestValue: 3)
let shuffledD3 = GKShuffledDistribution(lowestValue: 1, highestValue: 3)
let gausianD3 = GKGaussianDistribution(lowestValue: 1, highestValue: 3)
for i in 0..<30 {
    randoms.addObject(randomD3.nextInt())
    shuffles.addObject(shuffledD3.nextInt())
    gausians.addObject(gausianD3.nextInt())
}

print("Random:")
randoms.forEach{
    print("\($0) \(randoms.countForObject($0))")
}

print("Shuffled:")
shuffles.forEach{
    print("\($0) \(shuffles.countForObject($0))")
}

print("Gausian:")
gausians.forEach{
    print("\($0) \(gausians.countForObject($0))")
}