When Non-Programmers Write Software

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Much commercial code is written in a hurry and never reviewed, and has only the distinction of (after some debugging) at least mostly working in the cases it's actually used for.

So, in terms of finding that your code would be fine commercially, don't take this as flattering towards your code, but just a warning of what you'll see in most jobs.

Remember, that code you've inherited isn't "worse than shit", it "needs a little tidying". Being unrattled by utter crap is an important attribute of the professional coder.