It can be used on a type to control Nullability, it is then called the "Null Forgiving Operator". Basically, null! applies the !

Understanding the Context

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. The expression "NULL = NULL" evaluates to NULL, but is actually invalid in SQL; yet ORDER BY treats NULLs as equal (whatever they precede or follow "regular" values is left to DBMS vendor). Understanding the difference between “IS NULL” and “= NULL” When a variable is created in SQL with the declare statement it is created with no data and stored in the variable table (vtable) inside SQLs memory space.

Key Insights

The vtable contains the name and memory address of the variable. 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 yegor256.

Final Thoughts

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 ... The surprise expressed by JavaScript developers at typeof null === "object" is the result of an impedance mismatch (or abstraction leak) between a weakly-typed language (JavaScript) that has both null and undefined, and another, strongly-typed language (Java) that only has null, and in which null is strictly defined to refer to a reference type ... javascript - Why is null an object and what's the difference between ...