design - Approach to designing large functional programs -

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I've been reading a lot in functional languages ​​and maybe parts of my application to F #. Is it better to design from outside or inside?

I am not an expert at all on this subject, but here an article on this topic, 'our' There is a link by:

And some questions are SO & amp; Programmers (where - incidentally - I suspect this question would be better)



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