Simplicity is the ultimate sophistication.
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Perhaps the title was just trying to grab ones eye, but I don't think you must absolutely know any of these. I'd just use a library that has a method to do all of these things.
For example: NumberUtils.isEven(...) is better than the bit hack because it's:
1) More readable
2) More tested
3) More distributable since it's already a library
4) Less work because I didn't have to write/think of it
I did find the article to be very interesting though. Thanks
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