Kotlin Constructors

snippet.kt

// Primary constructor declaration
class Person constructor(name: String) { ... }

// The constructor keyword can be omitted if there's 
// no visibility modifiers nor any annotations
class Person(name: String) { ... }

// Property initialization
class Person(_firstName: String, _lastName: String) {
  val firstName = _firstName.capitalize()
  val lastName = _lastName.capitalize()
  val fullName: String
  
  init { // using initializer blocks
    fullName = "$firstName $lastName"
  }
}

// You can declare properties in the primary constructor
class Person(val firstName: String, val lastName: String, var age: Int)

// Kotlin supports default arguments
class Person(val firstName: String = "John", val lastName: String = "Doe")