Android Development with Kotlin

Destructuring in lambda expressions

In Chapter 4, Classes and Objects, we saw how objects can be destructured into multiple properties using destructuring declarations:

data class User(val name: String, val surname: String, val phone: String) 
 
val (name, surname, phone) = user 

Since version 1.1, Kotlin can use destructuring declarations syntax for lambda parameters. To use them, you should use parentheses that include all the parameters that we want to destructure into:

    val showUser: (User) -> Unit = { (name, surname, phone) -> 
        println("$name $surname have phone number: $phone")  
    } 
    val user = User("Marcin", "Moskala", "[phone]") 
    showUser(user)     // Marcin Moskala have phone number: [phone] 

Kotlin's destructing declaration ...