Kotlin Academy · Lesson

init Blocks and Initialization Order

Use init blocks and understand the order of property and block initialization.

What Is an init Block?

An init { } block contains code that runs when an instance is constructed. It is part of the primary constructor logic.

The init block runs during construction, after property initializers in source order.

class Logger(val name: String) {
    init {
        println("Constructed Logger("$name")")
    }
}
fun main() {
    val l = Logger("auth")
}