benchmarking String vs. Data reading and processing.

FileParse.swift

    func strings(from name: String) -> [String]? {
        let date = Date()
        guard let path = Bundle.main.path(forResource: name, ofType: "yaml") else {
            return nil
        }
        do {
            let fileString = try String(contentsOfFile: path, encoding: .utf8)
            let fileTime = date.timeIntervalSinceNow
            let lines = fileString.components(separatedBy:"\n")
            let end = date.timeIntervalSinceNow
            print("strings from \(fileTime) -- \(end)")
            return lines
        } catch {
            return nil
        }
    }

    func bytes(from file: String) {
        let start = Date()
        guard let path = Bundle.main.path(forResource: file, ofType: "yaml") else { return }
        offsets = [Int]()
        do {
            words = try Data(contentsOf: URL(fileURLWithPath: path), options: .alwaysMapped)
            let fileTime = start.timeIntervalSinceNow
            let bytesPtr = (words as NSData?)!.bytes
            let newLine = UInt8(10)
            var cur = 0
            let end = words!.count
            while cur < end {
                if (bytesPtr.advanced(by: cur).assumingMemoryBound(to: UInt8.self).pointee == newLine) {
                    offsets!.append(cur + 1)
                }
                cur += 1
            }
            offsets!.append(end)
            let stop = start.timeIntervalSinceNow
            print("bytes from \(fileTime) -- \(stop)")
        } catch {
            print("fail url")
        }
    }