Sequence.sorted(by:sortRepresentation:).swift

extension Sequence {
    func sorted<SortKey>(
        by areInIncreasingOrder: (SortKey, SortKey) throws -> Bool,
        sortKey makeSortKey: (Element) throws -> SortKey
    ) rethrows -> [Element] {
        try self
            .map { (key: try makeSortKey($0), element: $0) }
            .sorted { try areInIncreasingOrder($0.key, $1.key) }
            .map { $0.element }
    }
}