there are probably more primitive types that i am ...

# getting-started

[Smallville7123]

there are probably more primitive types that i am missing

[diesieben07]

String is also not a primitive type.

[diesieben07]

Like was said before: what are you trying to accomplish here?

[Smallville7123]

oh it isnt

[Smallville7123]

well at least it initializes it to ""

[karelpeeters]

You're also missing every possible type anyone ever declares without giving it a default no-args constructor, which is the real flaw with your approach.

[Smallville7123]

such as if someone declares class a(v : Int) ?

[Smallville7123]

also how can i check if a type is nullable

[Smallville7123]

as i just discovered i can explicitly set a non nullable type as null

fun <E> makeNull(v: AbstractList<E>) {
    v[0] = null
}

fun ret() {
    val ff = arrayListOf<Int>()
    ff.add(5)
    println("ff[0] = ${ff[0]}")
    makeNull(ff)
    println("ff[0] = ${ff[0]}")
    abort()
}

ff[0] = 5
ff[0] = null

[diesieben07]

That code does not compile.

[diesieben07]

Unless you are using java.util.AbstractList. In that case: yes, java types are not null-safe.

[diesieben07]

https://kotlinlang.org/docs/reference/java-interop.html#null-safety-and-platform-types

[Smallville7123]

ok, does kotlin have its own version of AbstractList?

[karelpeeters]

You should never be using AbstractList (neither in Java nor in Kotlin), use the List or MutableList interface.

[Smallville7123]

I'll try to use those instead