Kotlin Programming Cookbook

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Similar to extension properties, we can have companion object extensions, which means we can add methods to the companion object of a class that helps us access it in a static way. Let's look at an example. Suppose we have a Student class:

class Student(val age:Int){    companion object{            }}

Let's now add an extension method to the companion object:

fun Student.Companion.sayHi(){    println("Hi")}

Now you can access it on the class without creating an instance of the class:

Student.sayHi()