Null and Null aware

int x; // The initial value of any object is null
// ?? null aware operator
x ??=6; // ??= assignment operator, which assigns a value of a variable only if that variable is currently null
print(x); //Print: 6
x ??=3;
print(x); // Print: 6 - result is still 6
print(null ?? 10); // Prints: 10. Display the value on the left if it's not null else return the value on the right