Mastering High Performance with Kotlin

Inspecting the lazy function

Let's inspect the lazy delegate:

fun main (args: Array<String>) {    val lazyValue by lazy { }}

The lazy function isn't an inline function, so the bytecode contains a separate class for the initializer lambda. The simplified bytecode for this class looks like this:

final class delegation/kotlin/MainKt$main$lazyValue$2 extends kotlin/jvm/internal/Lambda  implements kotlin/jvm/functions/Function0  {    public synthetic bridge invoke()Ljava/lang/Object;    public final invoke()V    <init>()V    public final static Ldelegation/kotlin/MainKt$main$lazyValue$2; INSTANCE    static <clinit>()V                final static INNERCLASS delegation/kotlin/MainKt$main$lazyValue$2 null null}

The simplified bytecode of the Main class looks like this:

public final ...