How to convert Data to hex string in swift

Question

I want the hexadecimal representation of a Data value in Swift.

Eventually I\'d want to use it like this:

let data = Data(base64Encoded: \"aGVsbG8gd2         


        

Answer 1

A bit different from other answers here:

extension DataProtocol {
    func hexEncodedString(uppercase: Bool = false) -> String {
        return self.map {
            if $0 < 16 {
                return "0" + String($0, radix: 16, uppercase: uppercase)
            } else {
                return String($0, radix: 16, uppercase: uppercase)
            }
        }.joined()
    }
}

However in my basic XCTest + measure setup this was fastest of the 4 I tried.

Going through a 1000 bytes of (the same) random data 100 times each:

Above: Time average: 0.028 seconds, relative standard deviation: 1.3%

MartinR: Time average: 0.037 seconds, relative standard deviation: 6.2%

Zyphrax: Time average: 0.032 seconds, relative standard deviation: 2.9%

NickMoore: Time average: 0.039 seconds, relative standard deviation: 2.0%

Repeating the test returned the same relative results. (Nick and Martins sometimes swapped)