What is the right way of using “greater than”, “less than” comparison on nullable integers in Kotlin?

Question

var _age: Int? = 0

public var isAdult: Boolean? = false
   get() = _age?.compareTo(18) >= 0 

This still gives me a null-safety, compile error,

Answer 1

Also can try this:

var position = 100

    mArrayList?.let {

                if (it.size > 0 && position >= 0 ) 
                     return true

            }