function accepts one argument either object or null
109927
JavaScript null check
128709
Why is there a `null` value in JavaScript?
115412
Why does this function fail when a non-function version of the same code works?
118541
How to pass a default argument value of an instance member to a method?
5377
Is there a standard function to check for null, undefined, or blank variables in JavaScript?
93804
How to check for a Null value in VB.NET
127452
Why is typeof null "object"?
79162
Javascript null or empty string does not work
65944
Easier way of writing null or empty?
96843
What will happen when I call a member function on a NULL object pointer?
2116
IllegalArgumentException or NullPointerException for a null parameter?
67597
Can constructor return a null object?
142937
Cast object to decimal? (nullable decimal)
74359
How would I skip optional arguments in a function call?
102290
Cannot assign null to anonymous property of type array
109300
Handle either a list or single integer as an argument
92446
C#: How to pass null to a function expecting a ref?