`?.` (null-safe attribute) operator

The left-associative, binary ?. operator is used to access an attribute as if its right-hand operand were not null.

Usage

void m(Integer? num) {
    Integer? int = num?.positiveValue;
}

The meaning of ?. is defined as follows:

if (exists lhs) lhs.member else null

The ?. operator is not polymorphic.

The result type of the lhs?.rhs operator is the optional type of the right hand operand.