What operators exist in Null-safety?

In Null Safety in Flutter, the following operators related to nullable types are used:

? (Question Mark): Declares a variable as nullable.

String? nullableString; // Variable can contain String or null

! (Bang Operator / Non-nullable Assertion): Guarantees to the compiler that the value is not null at this moment. Use with caution, as it can cause a runtime error if the value turns out to be null.
```
String nonNullableString = nullableString!; // Guarantee that nullableString is not null
```

?? (Null Coalescing Operator): Provides a fallback value if the left side of the expression is null.

String result = nullableString ?? "Default Value"; // If nullableString is null, result will be "Default Value"

??= (Null Coalescing Assignment Operator): Assigns the value on the right to the variable only if the left side is null.
```
String? variable;
variable ??= "Initial Value"; // If variable is null, assign "Initial Value"
```
?. (Null-aware Access Operator): Allows safe access to members of an object that may be null. If the object is null, the expression returns null.
```
String? nullableString;
int? length = nullableString?.length; // If nullableString is null, length will be null
```
?[] (Null-aware Index Operator): Allows safe access to list elements or Map entries that may be null. If the list or Map is null, the expression returns null.
```
List<int>? nullableList;
int? firstElement = nullableList?[0]; // If nullableList is null, firstElement will be null
```