Is the separation of program logic and presentation layer going too far?
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Timwi
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Published on 2012-12-16T13:07:20Z
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2012/12/16
17:20 UTC
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In a Drupal programming guide, I noticed this sentence:
The theme hook receives the total number of votes and the number of votes for just that item, but the template wants to display a percentage. That kind of work shouldn't be done in a template; instead, the math is performed here.
The math necessary to calculate a percentage from a total and a number is (number/total)*100
. Is this application of two basic arithmetic operators within a presentation layer already too much? Is the maintenance of the entire system severely compromised by this amount of mathematics?
The WPF (Windows Presentation Framework) and its UI mark-up language, XAML, seem to go to similar extremes. If you try to so much as add two numbers in the View (the presentation layer), you have committed a cardinal sin. Consequently, XAML has no operators for any arithmetic whatsoever.
Is this ultra-strict separation really the holy grail of programming? What are the significant gains to be had from taking the separation to such extremes?
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