Demonstrate possible collection of emoji use data with random sampling for differential privacy

diffpriv.swift

import Cocoa; import Foundation

func randomBool() -> Bool {
    return arc4random_uniform(2) == 0 ? true: false
}

// A list of all emojis (
let emojis = ["😀","😁","🙍🏾","🐺","🏃","🛂","💸","💰","💎","🌂","👝","👛","👜","🆔","🌀","🔻","💩"]

// A "collected list" of most used emojis
var mostUsedEmojis = ["💩","😀","😁","💰","🌀"]

// Get a random True or False valuse
if randomBool() {
    // Don't use collected customer emoji data, choose 5 random emojis instead
    mostUsedEmojis = []
    while(mostUsedEmojis.count < 5) {
        var randEmoji = emojis[Int(arc4random_uniform(UInt32(emojis.count)))]
        if !(mostUsedEmojis.contains(randEmoji)) {
            mostUsedEmojis.append(randEmoji)
        }
    }
}

// "Send" emoji list to Apple
print(mostUsedEmojis)