Swift 4 Data reading options

Question

What is the correct translation of this Objective C code line to Swift 4?

NSData *mappedData =
  [NSData dataWithContentsOfURL:fileURL
                        options:NSDataReadingMappedAlways + NSDataReadingUncached
                          error:&error];

I tried this but it doesn't compile:

 Data(contentsOf: fileUrl, options: Data.ReadingOptions.dataReadingMapped | Data.ReadingOptions.uncached)

Answer 1

You can try

do {

     // note it runs in current thread

    let data = try Data(contentsOf:fileURL, options: [.alwaysMapped , .uncached ] )

    print(data)

}
catch {

    print(error)
}