Kotlin can also write recursive lambda

kotlin-lambda-rec.kt

package main

/**
 * Created by ice1000 on 2017/5/2.
 *
 * @author ice1000
 */

fun main(args: Array<String>) {
	fun lambda(it: Int): Int =
			if (it <= 2) 1 else lambda(it - 1) + lambda(it - 2)
	(1..10)
			.map(::lambda)
			.forEach(::println)

	var lambda2: (Int) -> Int = { it }
	lambda2 = { if (it <= 2) 1 else lambda(it - 1) + lambda(it - 2) }
	(1..10)
			.map(lambda2)
			.forEach(::println)
}

Your lambda2 is not recursive, it calls lambda by mistake.

You can make it recursive using lateinit:

lateinit var lambda2: (Int) -> Int
lambda2 = { if (it <= 2) 1 else lambda2(it - 1) + lambda2(it - 2) }

Oh, it was written long ago and there weren't local lateinit back then. Thanks for the suggestion!