IntelliJ is saying Local Variable is redundant. I placed the equation there to store it, so I can debug/see the variable before returning it. Is there any easy way to debug, or else, I would have to copy the whole variable equation in the debugger window to see its value.
IntelliJ IDEA offers several ways to evaluate expressions while in debug mode:
The obvious one, by hovering over a variable or by having a look at the automatically added local variable watches. This is what you are doing now, but forces you to change the code in such a way that you have such a variable and some static code analysis tools will complain.
Add a manual watch for the variable or expression you are interested in.
Select an expression or subexpression, right click and select Quick Evaluate Expression
Hover over a (sub-)expression, hold Alt and left click
Note that point 2–4 will re-evaluate any expression. If you have side effects or non-idempotent expressions, you might not want to do this. In that case, your only choice is a temporary and redundant variable.