A random generator for private building tiles in Great Western Trail.

GreatWesternTrailRandomTile.swift

import Foundation

extension String {
	func pad(to length: Int) -> String {

		guard self.characters.count < length else {
			return self
		}

		let padded = "0" + self
		return padded.pad(to: length)
	}
}

let random = arc4random_uniform(1024)
let string = String(random, radix: 2, uppercase: true).pad(to: 10)

print(random)

for (index, character) in string.characters.enumerated() {

	let value = Int(String(character))!
	let side = value == 0 ? "A" : "B"

	print(index+1, side)
}

Will print out the number of the combination, along with what the tiles should be, such as:

829
1 B
2 B
3 A
4 A
5 B
6 B
7 B
8 B
9 A
10 B