// Test the `first` and `last` methods. #test("Hello".first(), "H") #test("Hello".last(), "o") #test("🏳️‍🌈A🏳️‍⚧️".first(), "🏳️‍🌈") #test("🏳️‍🌈A🏳️‍⚧️".last(), "🏳️‍⚧️")