createInstance

Creates a new instance of the class, calling a constructor which either has no parameters or all parameters of which have a default value. If there are no or many such constructors, an exception is thrown.

@ExperimentalJsReflectionCreateInstancefun <T : Any> KClass<T>.createInstance(): T(source)

import kotlin.reflect.full.createInstance
import kotlin.reflect.jvm.ExperimentalJsReflectionCreateInstance

@OptIn(ExperimentalJsReflectionCreateInstance::class)
fun main() {
    data class Person(val name: String = "Alice", val age: Int = 28)

    // Create an instance using the no‑arg/default constructor via reflection
    val person = Person::class.createInstance()

    println(person)  // Output: Person(name=Alice, age=28)
}

Source