Kotlin by Example: Extension methods

In Kotlin, it is possible to define methods for classes outside the definition of those classes with a concept called extension methods.
For example, we can define a new method on the `String` class. Here, `String` is called the receiver type and `this` is called the receiver object.	fun String.lastChar() = this.get(this.length - 1) fun main() {
Now, we can simply use the method as if it were a "native" method defined in the `String` class.	println("Howdy".lastChar()) }
Note that extension methods can not access private or protected members of the receiver object.

$ kotlinc main.kt -include-runtime -d main.jar

$ java -jar Main.jar