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Morendil comments on Quixey Engineering Screening Questions - Less Wrong
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Tee-hee. There are many ways to skin these cats. :)
(What puzzles me is why the formulation of the problem fails to ban the absolutely trivial solution that uses neither type of loop. Wondering if that's intentional or a brain fart.)
If you're thinking of writing n lines of code with calls to alert(), it doesn't work because you have to submit a constant-sized program before you see n. Otherwise please email me this trivial solution because I may have overlooked it.
Actually the brainfart was on my part. I'd forgotten that a common instruction doesn't exist in Javascript, though that hasn't kept some folks from implementing one, as a workaround. (The mind boggles.)
You'll need to specify which version of Javascript to target, since some slightly less obvious solutions may involve version-dependent features.
My current solution is 12 lines long and uses only recursion and function calls and addition and variable assignments.