Top "Null" questions

What is null in Java?

What is null? Is null an instance of anything? What set does null belong to? How is it represented in …

java null terminology

return, return None, and no return at all?

Consider three functions: def my_func1(): print "Hello World" return None def my_func2(): print "Hello World" return def my_…

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What is the difference between NULL, '\0' and 0?

In C, there appear to be differences between various values of zero -- NULL, NUL and 0. I know that the …

c pointers null

Java null check why use == instead of .equals()

In Java I am told that when doing a null check one should use == instead of .equals(). What are the …

java null

What is a 'NoneType' object?

I'm getting this error when I run my python script: TypeError: cannot concatenate 'str' and 'NoneType' objects I'm pretty sure …

python null nonetype

Which @NotNull Java annotation should I use?

I'm looking to make my code more readable as well as use tooling like IDE code inspection and/or static …

java nullpointerexception null annotations ide

Origin null is not allowed by Access-Control-Allow-Origin

I have made a small xslt file to create an html output called weather.xsl with code as follows: <!…

javascript null xmlhttprequest cors localhost

NULL values inside NOT IN clause

This issue came up when I got different records counts for what I thought were identical queries one using a …

sql sql-server tsql null notin

How to resolve TypeError: Cannot convert undefined or null to object

I've written a couple of functions that effectively replicate JSON.stringify(), converting a range of values into stringified versions. When …

javascript null undefined

Best way to check if a Data Table has a null value in it

what is the best way to check if a Data Table has a null value in it ? Most of the …

c# .net validation datatable null