It can be used on a type to control Nullability, it is then called the "Null Forgiving Operator". Basically, null! applies the ! operator to the value null. This overrides the nullability of the value null to non-nullable, telling the compiler that null is a "non-null" type.
yegor256. About null from JLS. "The Null Literal. The null type has one value, the null reference, represented by the null literal null, which is formed from ASCII characters. A null literal is always of the null type." About points in article. 'Mutable and Incomplete Objects' is a feature. 'Slow Failing' is a ability by design. 'Computer Thinking vs. Object Thinking' are just two ways of ...
Cuál es la diferencia en JavaScript entre una variable undefined y una variable null? cómo puedo saber si una variable está null, undefined o ambos? también quisiera saber si son lo mismo?
null = null should be true. null is well-defined value which may represent an unknown value, but it may also represent the absence of a value. It should be up to the developer to decide what null represents, but null itself is absolutely a value and null is null = null.
In C, there appear to be differences between various values of zero -- NULL, NUL and 0. I know that the ASCII character '0' evaluates to 48 or 0x30. The NULL pointer is usually defined as: #define
What is the difference between NULL, '\0' and 0? - Stack Overflow
The main difference between e != null and e is not null is the way the the compiler executes the comparison. Microsoft: "The compiler guarantees that no user-overloaded equality operator == is invoked when expression x is null is evaluated." Bottom Line: If you are writing code that you don't want to depend on someone's implementation of the != and == operators, use is null and is not null ...