Mastering Kotlin Essentials/

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Introduction to Extensions

Introduction to Extensions

Learn about extension functions in Kotlin, how to define and use them to extend classes, and their similarities to member functions.

We'll cover the following...

Introduction to class members

The most intuitive way to define methods and properties is inside classes. Such elements are called:

  • Class members

  • Member functions

  • Member properties

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class Telephone(
    // member property
    val number: String
) {
    // member function
    fun call() {
        print("Calling $number")
    }
}
fun main() {
    // Usage
    val telephone = Telephone("123456789")
    println(telephone.number) // 123456789
    telephone.call() // Calling 123456789
}

Introduction to extension functions

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