Opera 12 - Make it yours | BROWSER FOR COMPUTER | OPERA

Business rules and formulas are among the most important parts of our code, and they are top candidates for constant change. So don't expose (hard-code) them in your programs! No matter how simple, they should be hidden behind a procedure or function, usually a function, especially for formulas. That way, it is defined in one place and can be easily maintained. In this video, Steven shows examples of this process, and emphasizes that even with the most obvious rules, you can never assume it will stay correct.
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