Replace only the first instance of a substring in an NSString

A more Swift'y version of the implementations posted here. This one matches the syntax replacingOccurrences(of:with:) in Swift 5.1

extension String {

    func replacingFirstOccurrence(of target: String, with replacement: String) -> String {
        guard let range = self.range(of: target) else { return self }
        return self.replacingCharacters(in: range, with: replacement)
    }
}

An example of usage:

let string = "I like bacon, please give me some more bacon!"
let newString = string.replacingFirstOccurrence(of: "bacon", with: "meat")

Assuming the following inputs:

NSString *myString = @"My blue car is bigger then my blue shoes or my blue bicycle";
NSString *original = @"blue";
NSString *replacement = @"green";

The algorithm is quite simple:

NSRange rOriginal = [myString rangeOfString:original];

if (NSNotFound != rOriginal.location) {
    myString = [myString stringByReplacingCharactersInRange:rOriginal withString:replacement];
}

SWIFT 3 and 4 UPDATE:

extension String 
{
    func stringByReplacingFirstOccurrenceOfString(
            target: String, withString replaceString: String) -> String
    {
        if let range = self.range(of: target) {
            return self.replacingCharacters(in: range, with: replaceString)
        }
        return self
    } 
}