Using an OptionSet with a Dictionary

optionset_dictionary.swift

let DictionaryLookUp : [OptionSetHash: Bool] = [
    .first:  true,
    .second: false,
    .third:  true
]

// Example: cycling through options in a dictionary
var options = OptionSetHash.init(rawValue: 0)

for (key, value) in DictionaryLookUp {
    if(value) {
        options.update(with: key)
    }
}

// Example: Only remember the first truthy look up
// 
// Say you only wanted to unlock one achievement at a time
//
var options = OptionSetHash.init(rawValue: 1)

for (key, value) in DictionaryLookUp {
    if(value && !options.contains(key)) {
        options.update(with: key)
        break
    }
}