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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.
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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 The null reference can always be cast to any reference type.
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In practice, the programmer can ignore the null type and just pretend that null is merely a special literal that can be of any reference type. What is null? As the JLS quote above says, in practice you can simply pretend that it's "merely a special literal that can be of any reference ... 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 ...