Kotlin Extensions: Enhancing Classes

Introduction

Kotlin Extensions are a powerful feature in Kotlin that allows you to add new functions to existing classes without modifying their source code. These functions are called extension functions.

fun String.hasSpaces(): Boolean {
    return this.contains(" ")
}

In this example, we’ve added a new function hasSpaces() to the String class. This function checks if the string contains any spaces.

Using Extension Functions

You can use extension functions just like any other function in the class. Here’s how you can use the hasSpaces() function:

val myString = "Hello, World!"
println(myString.hasSpaces()) // prints: true

Conclusion

Kotlin Extensions provide a clean and concise way to add functionality to existing classes. They’re a great tool to have in your Kotlin toolbox!