Why does a defined variable become undefined if it's not updated in a try except block?
1462
UnboundLocalError on local variable when reassigned after first use
113905
How can I check whether a variable is defined in JavaScript?
49763
Problem with "scopes" of variables in try catch blocks in Java
138196
How do I pass data between hooks that don't interact?
125535
How do I fix this "identifier is not declared in the current scope" error?
53203
Checking for undefined
77925
Why does changing the returned variable in a finally block not change the return value?
83782
How to check a not-defined variable in JavaScript
141638
Yield return from a try/catch block
140826
Force JavaScript exception/error when reading an undefined object property?
102826
Easy way to check that a variable is defined in python?
114169
Why can't we define a variable inside a while loop?
108994
How can I get around declaring an unused variable in a for loop?
78122
What's the behavior of an uninitialized variable used as its own initializer?
134603
Why doesn't a Javascript return statement work when the return value is on a new line?
57
Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference
1340
What are "sequence points" and how do they affect undefined behavior?