Why does my method return null when I set max to null ? It should be initialized within the conditional statement

Question

I'm trynna return the variable with the highest domain within a set of domains and set of variables
https://code.sololearn.com/ca0322a2VI7S/?ref=app

Answer 1

It's hard to say without seeing a working version of the code, and your actual test cases. For example if your set of vars has 0 or 1 element, then max is never properly initialized.