Comments on: Vertical Slicing http://barelyenough.org/blog/2010/07/vertical-slicing/ … and there is much to be learned Tue, 17 Jan 2012 22:46:55 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Peter Williams http://barelyenough.org/blog/2010/07/vertical-slicing/comment-page-1/#comment-84600 Peter Williams Tue, 13 Jul 2010 18:41:56 +0000 http://barelyenough.org/?p=466#comment-84600 <p>Devon,</p> <p>I apply DRY at the semantic level, rather than syntactic. Doing so makes it equivalent to SPOT, in my opinion. The formal definition of DRY is:</p> <blockquote> <p>Every piece of knowledge must have a single, unambiguous, authoritative representation within a system</p> </blockquote> <p>That seems quite the same as SPOT. (Without the unsavory implication that anything like truth can occur in a computer program.)</p> <p>I see your point about the potential misapplication of DRY. It certainly has the potential to result in excessive complexity if applied incorrectly. However, in my experience, it is far more common for it to be under applied, or ignored entirely, than to be applied at the wrong level.</p> Devon,

I apply DRY at the semantic level, rather than syntactic. Doing so makes it equivalent to SPOT, in my opinion. The formal definition of DRY is:

Every piece of knowledge must have a single, unambiguous,
authoritative representation within a system

That seems quite the same as SPOT. (Without the unsavory implication that anything like truth can occur in a computer program.)

I see your point about the potential misapplication of DRY. It certainly has the potential to result in excessive complexity if applied incorrectly. However, in my experience, it is far more common for it to be under applied, or ignored entirely, than to be applied at the wrong level.

]]> By: Devon Jones http://barelyenough.org/blog/2010/07/vertical-slicing/comment-page-1/#comment-84599 Devon Jones Tue, 13 Jul 2010 15:22:53 +0000 http://barelyenough.org/?p=466#comment-84599 <p>I quite agree. My only area of significant difference is that I prefer to aim for SPOT (single point of truth) as opposed to DRY. My contention is that when people try to overgeneralize code so that no code is ever repeated, that code becomes inherently more complicated. If instead you target a system having a SPOT for each piece of data or process, you ensure avoiding connascence of algorithm while allowing the code in each piece to be as simple as possible. IMHO DRY drives code complexity in ways that SPOT does not. Worded another way, sometimes a little repetition is preferred.</p> I quite agree. My only area of significant difference is that I prefer to aim for SPOT (single point of truth) as opposed to DRY. My contention is that when people try to overgeneralize code so that no code is ever repeated, that code becomes inherently more complicated. If instead you target a system having a SPOT for each piece of data or process, you ensure avoiding connascence of algorithm while allowing the code in each piece to be as simple as possible. IMHO DRY drives code complexity in ways that SPOT does not. Worded another way, sometimes a little repetition is preferred.

]]> By: Kevin Weller http://barelyenough.org/blog/2010/07/vertical-slicing/comment-page-1/#comment-84588 Kevin Weller Mon, 12 Jul 2010 23:37:09 +0000 http://barelyenough.org/?p=466#comment-84588 <p>Nicely put. However, vertical and horizontal slicing are not mutually exclusive...they can be effectively combined.</p> Nicely put. However, vertical and horizontal slicing are not mutually exclusive…they can be effectively combined.

]]> By: Tweets that mention Peter Williams - Vertical Slicing -- Topsy.com http://barelyenough.org/blog/2010/07/vertical-slicing/comment-page-1/#comment-84584 Tweets that mention Peter Williams - Vertical Slicing -- Topsy.com Mon, 12 Jul 2010 17:27:25 +0000 http://barelyenough.org/?p=466#comment-84584 <p>[...] This post was mentioned on Twitter by Jim Ray. Jim Ray said: RT @pezra: New blog post: Vertical slicing http://barelyenough.org/blog/2010/07/vertical-slicing [...]</p> [...] This post was mentioned on Twitter by Jim Ray. Jim Ray said: RT @pezra: New blog post: Vertical slicing http://barelyenough.org/blog/2010/07/vertical-slicing [...]

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