Nullable Array Notation

Question

I am new to nullable.

Is there a meaningful difference between the possible notations? string?[] str string[]? str and even string?[]? str seems to all be valid

Answer 1

When we put ? after reference type we allow the instance to be null. So we have

• string?[] - string array where we allow the items to be null (but array itself can't be null)
• string[]? - string array which can be null itself (but it can't have null items)
• string?[]? - both array and its items allowed to be null