Extension Function

extension_function.kt

fun main() {
    "Hi".singleQuote()
    "Hello".strangeQuote()

    val player = Player(name = "Sachin", team = "India")
    player.hobbies(player.name)
}

fun String.singleQuote() = "'${this}'"
fun String.doubleQuote() = "\"${this}\""

fun String.strangeQuote(): String {
    // we can also access all the public member functions of String
    return this.singleQuote().uppercase()
}

data class Player(val name: String, val team: String) {

    private val id: Long = 98

    private fun suspend() {

    }
}

fun Player.hobbies(name: String): List<String> {
    //this.id // not possible since it is private
    //this.suspend() // not possible since it is private

    return when(name) {
        "Sachin" -> listOf("Art", "Coins")
        else -> listOf()
    }
}