Optional variable - variable might not be initialized
599
Is Java "pass-by-reference" or "pass-by-value"?
51797
Java: Initialize multiple variables in for loop init?
116891
Objective C - XCode not recognizing variable outside of if statement
40229
How do I check if a variable exists?
81518
Find out what variable is throwing a NullPointerException programmatically
36791
C# 4.0, optional parameters and params do not work together
157501
How do I set variables for variable_get()?
5975
How to avoid returning a Null if there is no "else" condition in an If construct
152318
Quick issue regarding "if" statement
140826
Force JavaScript exception/error when reading an undefined object property?
89331
Variable does not exist in the current context?
96453
Caught Throwable or Exception is null
14413
How do I set a conditional compile variable?
114816
Is null reference possible?
40822
Optional parameters and inheritance
151869
What's the scope of a variable initialized in an if statement?
91006
Why can I refer to a variable outside of an if/unless/case statement that never ran?