<https://proandroiddev.com/kotlin-pearls-7-unit-nothing-any-and-null-cbbbbca86c2d>

# feed

[nfrankel]

https://proandroiddev.com/kotlin-pearls-7-unit-nothing-any-and-null-cbbbbca86c2d

[Burkhard]

great article, just one small correction: You state that null has no type, but it’s type is Nothing?. You mention that later by saying that Nothing? as a return type forces you to return null. You can also verify this with this code

val foo = null
println(::foo)

[nfrankel]

thanks!
but i’m not the author 😅

[bdawg.io]

Another thing I noticed is in this snippet:

//Java
public static Consumer<Integer> printNum = x -> System.out.println("Num " + x);

//Kotlin
fun callMe(block: (Int) -> Unit): Unit = (1..100).forEach(block)

fun main(){
    callMe { Lambdas.printNum } //it works fine
}

nothing would happen because he's not actually passing in the function (and as far as I understand it won't compile). I believe the following was actually meant

callMe(Lambdas::printNum) // it works fine