Preferred way to check object property is `null` or `undefined`
27606
Detecting an undefined object property
126006
How to find out if an Object is a collection or single value?
26859
Comparing object properties in c#
127819
How to check whether an object is a date?
113905
How can I check whether a variable is defined in JavaScript?
54646
How undefined is undefined behavior?
5640
How to check a string against null in java?
48235
Setting Objects to Null/Nothing after use in .NET
140826
Force JavaScript exception/error when reading an undefined object property?
91315
How can I make console.log show the current state of an object?
5975
How to avoid returning a Null if there is no "else" condition in an If construct
148793
Checking Textbox Text for Null
19902
Shortcut for "null if object is null, or object.member if object is not null"
93804
How to check for a Null value in VB.NET
129023
Null check in an enhanced for loop
8878
How to ignore a property in class if null, using json.net
120566
Compare two objects in Java with possible null values