Dictionary mapValues

Dictionary+mapValues.swift

extension Dictionary {
    func mapValues<TransformedValue: Sequence where Value: Sequence>(transform: (Value) -> TransformedValue) -> Dictionary<Key, TransformedValue> {
        var newDict: [Key: TransformedValue] = [:]
        for (k, v) in self {
            newDict[k] = transform(v)
        }
        return newDict
    }
}

let dict = [
    1: ["foo", "bar"],
    2: ["baz", "bar"]
]

let newDict = dict.mapValues {
    $0.sorted()
}

print(newDict)