c# - What does null! statement mean? - Stack Overflow
Feb 16, 2019 · 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 …
javascript - Why is null an object and what's the difference …
Apr 29, 2009 · 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 …
sql - Not equal <> != operator on NULL - Stack Overflow
Oct 9, 2014 · 135 NULL has no value, and so cannot be compared using the scalar value operators. In other words, no value can ever be equal to (or not equal to) NULL because NULL …
What is the difference between NULL, '\0' and 0? - Stack Overflow
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: …
How do I check for null values in JavaScript? - Stack Overflow
Jan 4, 2024 · And then == null does a perfect job, because it covers exactly those 2 values. (i.e. == null is equivalent to === null && === undefined) In exceptional cases you do want a clear …
What is the difference between "is not null" and "!= null"?
Sep 21, 2021 · The only difference (besides the syntax) is, that the compiler guarantees that no user-overloaded operator is called when using is not null instead of != null (or is null instead of …
SQL is null and = null - Stack Overflow
Mar 6, 2012 · The reasoning is that a null means "unknown", so the result of any comparison to a null is also "unknown". So you'll get no hit on rows by coding where my_column = null. SQL …
Why does NULL = NULL evaluate to false in SQL server
Dec 3, 2009 · 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 …
What is null in Java? - Stack Overflow
Apr 25, 2010 · What is null? Is null an instance of anything? What set does null belong to? How is it represented in the memory?
Java null check why use == instead of .equals() - Stack Overflow
Feb 5, 2012 · In Java I am told that when doing a null check one should use == instead of .equals(). What are the reasons for this?