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by EricBurnett
6013 days ago
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If you need 100% guarantees, then yes, do things in a purely functional way. However, I think the point is that in any sane program you can easily and safely make the assumption that + does not depend on pi in this situation. Yes, anything _can_ depend on any and all globals, but with proper practices, documentation, code reviews and what have you, one can make simplifying assumptions on what _will_ happen. |
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Or you can leave out the practices, documentation, and code reviews and use a functional language and get the same result. Yes, those things are useful for other reasons, but the current argument is about avoiding the inherent dangers of global variables.