Extension functions allow you to add new functionalities to existing classes without modifying their source code. This is particularly useful for enhancing third-party libraries, making your code cleaner and more expressive. By using extension functions, you can keep your codebase organized and promote code reuse.
fun String.isEmailValid(): Boolean { return android.util.Patterns.EMAIL_ADDRESS.matcher(this).matches() } // Usage example val email = "example@gmail.com" if (email.isEmailValid()) { println("Valid email address") } else { println("Invalid email address") }