Code Styling Debate: DOs and DON'Ts

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So, browsing the scripting forums, this post got me thinking:

Originally Posted by cbk1994

It's only necessary to use temp the first time, but I'd highly recommend using it throughout.

When are things acceptable, and when are they not? I know that many code styling related topics are completely based on preference. Nevertheless, I'd like to talk about your general preferences, what is acceptable to you and what is not.

Let's start off with the temp prefix Chris was talking about. I mostly agree with always using it, but I sometimes don't do it in generally long lines/function calls because I believe it destroys readability.

What are your thoughts on this?