By far, my single worst habit is making my code too terse. Typically I realize it only weeks later when I find myself needing to decipher it. When I first write it never seems too difficult to understand; this apparent legibility is an artifact, of course, but I have a hard time distinguishing it from the real thing. I'm not entirely cured of this bad habit, but at least I am aware of it.
My second worst habit is being too enamored of the whiz-bang features, the challenging syntax acrobatics, and the cool puzzles hidden in practically every programming task, which easily leads me to miss the best solutions when these happen to be boring. Again, I'm very aware of this, but in this case a cure is not even in sight.
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