How to judge a empty object?
4521
Is there an "exists" function for jQuery?
88414
How to test for a dropped item in Minecraft?
19902
Shortcut for "null if object is null, or object.member if object is not null"
27583
Determine if object is integer
110677
How is an empty set truly "empty"?
28523
When would the intersection of the empty set mean anything?
28379
How do I check to see if a text file is empty or does not exist in c++?
89960
Getting an empty JQuery object
133130
How to sort an array of objects containing null elements?
127289
Is there a need to set Objects to Nothing
14782
Determining if an Object is of primitive type
128954
How can we see objects that are so far away?
91340
Testing if a variable is empty in a shell script
576
How can I check for an empty/undefined/null string in JavaScript?
133050
How do I check if an image field is empty in a template file?
60948
How to change appearance of an Empty
6288
How do I check if an object has a specific property in JavaScript?