Is there a word that covers both Null and Undefined?
2772
Is there a "null coalescing" operator in JavaScript?
64884
Why `null >= 0 && null <= 0` but not `null == 0`?
32059
What is \null and when do we need to use it?
49446
How to check for an undefined or null variable in JavaScript?
56122
Is there any way to define pure functions with optional arguments?
121181
Are undefined terms allowed in a sequence?
69607
Do you use NULL or 0 (zero) for pointers in C++?
93804
How to check for a Null value in VB.NET
127005
' ... != null' or 'null != ....' best performance?
65589
How will I be able to remove [NSNull Null] objects from NSMutableArray?
15097
Is there any difference between IS NULL and =NULL
148793
Checking Textbox Text for Null
134996
How can I temporarily disable the "return value might be undefined" warning?
39781
Why does the is operator return false when given null?
153624
What's the difference between is_null($var) and ($var === null)?
154567
difference between null != something and something != null
27219
Is there any difference between type? and Nullable?