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2245
Length of a JavaScript object
37735
How can I check for "undefined" in JavaScript?
110677
How is an empty set truly "empty"?
104501
How do I enforce null checking?
46477
How to understand nil vs. empty vs. blank in Ruby
2146
object==null or null==object?
99241
Check if inputs are empty using jQuery
19902
Shortcut for "null if object is null, or object.member if object is not null"
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How to know if an object has an attribute in Python
103523
C++: What is the size of an object of an empty class?
3265
How can I test if a variable is empty or contains only spaces?
65944
Easier way of writing null or empty?
37350
checking each required input for empty value with jQuery
49446
How to check for an undefined or null variable in JavaScript?
39781
Why does the is operator return false when given null?
86651
How to determine if Javascript object is an event?
80984
How do I check if an HTML element is empty using jQuery?