arsalankhan994

fun main() {

    /*
    Without Extension Functions
    if we are using a class "SomeThirdPartyClass" and
    we want to add one more function, then
    we need to inherit the "SomeThirdPartyClass" class with
    "MyClass" and write that function inside it and
    use "MyClass" everywhere instead of "SomeThirdPartyClass" class
    */

arsalankhan994

fun main() {
    
    /*
    Without Extension Functions
    if we are using a class "SomeThirdPartyClass" and 
    we want to add one more function, then
    we need to inherit the "SomeThirdPartyClass" class with 
    "MyClass" and write that function inside it and
    use "MyClass" everywhere instead of "SomeThirdPartyClass" class
    */

arsalankhan994

fun main() {

    /*
    Primary Constructor Example
    */
    val primaryConstructorOnly = PrimaryConstructorOnly()
    println("My name is ${primaryConstructorOnly.name}")
    println("My age is ${primaryConstructorOnly.age}")

    val primaryConstructorWithParams = PrimaryConstructorWithParams(

arsalankhan994

main() {
  
    /*
    Class bound methods and variable
    */
    val someVariable = ClassBoundMethod
    someVariable.classBoundMethod()
    someVariable.name
  
}

arsalankhan994

main() {
    /*
    Data class example
    */
    val dataClass = StudentDataClass()
    dataClass.copy()
    dataClass.toString()
}

/*

arsalankhan994

fun main() {

    // Multi Condition in Kotlin using when/else
  
    val list = listOf("Erselan Khan", 27, "arsalankhan994@gmail.com")
    
    when(list[(list.indices).random()]) {
        "Erselan Khan" -> println("name is ${list[0]}")
        27 -> println("age is ${list[1]}")
        "arsalankhan994@gmail.com" -> println("email is ${list[2]}")

arsalankhan994

// we don't need to add open keyword

abstract class AbstractClasses() {
    abstract fun someAbstractMethod()
}

class SomeClassName: AbstractClasses() {
    override fun someAbstractMethod() {

    }

arsalankhan994

/*
Using open keyword to inherit this class
*/
open class InheritableClass {

}

/*
Try to Inherit inheritable class
*/

arsalankhan994

main() {
  
    /*
    object classes example
    */
    val singleton = SingletonClass.age
    println(singleton)
    SingletonClass.updateAge(20)
    println(SingletonClass.age)
    

arsalankhan994

fun main() {

    // Non changeable values in Kotlin
    val personAge = 27
    /*personAge = 26*/ // we can not reassign value to val variable

    // Changeable values in Kotlin
    var name = "Erselan Khan"
    name = "Khan Erselan"