I always get a bit nervous when I see Knuth's quote about premature optimisation. While the points the author makes are valid, the fact that it gets bandied about as an out-of-context sound bite results in a lot of code getting written with a complete disregard for any optimisation whatsoever.
Another far more common antipattern that isn't mentioned here is premature abstraction. You see a lot of this in enterprise .NET codebases -- such as the widespread "best practice" to build ineffective and obstructive abstraction layers "just in case you might want to swap out Entity Framework for a web service."
Another far more common antipattern that isn't mentioned here is premature abstraction. You see a lot of this in enterprise .NET codebases -- such as the widespread "best practice" to build ineffective and obstructive abstraction layers "just in case you might want to swap out Entity Framework for a web service."