How to use String.substringWithRange in Swift? Or how do Ranges work in Swift?

Hi everyone! I'm new to Swift, transitioning from Objective-C, and I'm having trouble working with strings. In Objective-C, I easily extracted substrings using `substringWithRange:`, for example: ```objc NSString *str = @"Hello, world!"; NSRange range = NSMakeRange(0, 5); NSString *substr = [str substringWithRange:range]; // "Hello" ``` In Swift, I'm trying to do the same thing but encountering errors. I wrote: ```swift let str = "Hello, world!" let range = NSMakeRange(0, 5) let substr = str.substringWithRange(range) // Error! ``` Xcode says that `String` doesn't have a `substringWithRange` method. I've read that in Swift you need to use `Range`, but I don't understand how to create it. Why can't I just pass an `NSRange`? Please explain with examples: 1.