Mastering Kotlin

Primary constructors

Primary constructors are defined inline with the class declaration using the following syntax:

class Student public constructor(_firstName: String, val lastName: String) {    ...}

If the constructor does not require any visibility modifiers or annotations, the constructor keyword can be omitted to reduce the boilerplate:

class Student (_firstName: String, val lastName: String) {    }

Within a primary constructor, we can pass arguments and define properties. If the constructor does not require any arguments or properties, then the parentheses can be omitted. In this case, a default empty constructor will be generated by the compiler, allowing the class to be instantiated as if it did have a defined constructor.

The following ...