Swift3 convert string value to hexadecimal string

Question

I am new to Swift and I want to convert a string into hexadecimal string. I have found a Objective-C function to a string into hexadecimal.

NSString * str = @"Say Hello to My Little Friend";

NSString * hexString = [NSString stringWithFormat:@"%@",
[NSData dataWithBytes:[str cStringUsingEncoding:NSUTF8StringEncoding]
                                         length:strlen([str cStringUsingEncoding:NSUTF8StringEncoding])]];

for (NSString * toRemove in [NSArray arrayWithObjects:@"<", @">", @" ", nil])
    hexString = [hexString stringByReplacingOccurrencesOfString:toRemove withString:@""];

NSLog(@"hexStr:%@", hexString);

Now I am unable to convert this function in Swift. Currently I am using Swift3.

Please someone can do this for me?

Answer 1

This produces the same output as the ObjC version

let str = "Say Hello to My Little Friend"
let data = Data(str.utf8)
let hexString = data.map{ String(format:"%02x", $0) }.joined()