The code is:
let redColor = "\u{001B}[0;31m"
var message = "Some Message"
print(redColor + message) //This doesn't work
print("\(redColor)\(message)") //This also doesn't work
and the output would look like this:
[0;31mSome Message
I've also read this post: Color ouput with Swift command line tool, and it doesn't seem to work.
I don't want to use libraries.
Nowadays, Xcode debugging console doesn't support coloring.