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June 9th, 2006
Steve Krug wrote a great book called Don't Make Me Think Buy tramadol no prescription, . In it he discusses how to improve your website's usability. Usability is great, but it shouldn't just apply to websites. Don't make me think should be applied anywhere possible, especially programming. One of the things that really annoyed me in PHP was trying to remember which parameter came in which order--was it the needle before the haystack or vice versa. #find in rails is a typical don't make me think method, buy tramadol no prescription. :first or :all is all that is required. Sure, there are several other options, Ultram For Narcotic Withdraw, but the order of them doesn't matter.
Person.find(:all, :conditions => ['name = ?', name], :order => 'name')
is the same as ...
Person.find(:all, :order => 'name', :conditions => ['name = ?', name])
Either way you will find all the people that meet the condition ordered by name. You don't have to remember which parameter comes first. 150 Tramadol, I tried to follow this ideal as strictly as possible when creating Addicted To Ma.gnolia, my first Ruby API project. Buy tramadol no prescription, Each main method call in my Ma.gnolia API class accepts a hash as a parameter and only a hash. Think about it for a sec. Which is easier to remember, to read and to understand. This ...
Magnolia.search('', 'jnunemaker', '', 3)
or this ...
Magnolia.search(:person => 'jnunemaker', generic tramadol bars, :rating => 3)
I think the second is for a couple of reasons. First, you don't have to remember the order of the parameters, buy tramadol no prescription. Does tags come before person. Does person come before or after rating. Or is it after group. These questions do not need to be asked.
The second reason is readability and understandability. Buy tramadol no prescription, If you were scanning the code of a project, which of the aforementioned examples would make it easier to understand what is going on. The first one leaves you wondering what the empty strings before and after 'jnunemaker' are for. The second, on the contrary, Purchase tramadol no prescription, is readable by even a non-programmer. Well, it means you are searching Magnolia for jnunemaker with a rating of 3. They might have no idea what Magnolia is but they would have an idea of what is going on. To that end, if a non-programmer can understand it then it should be even easier for a programmer.
Honestly, the only downside of this is more typing. I know personally, that I would rather type a little more and have more readable/understandable code anyday. So next time you code up a class, 100 Tramadol Free Shipping, don't just think how can I get this working, think how can I make this easier for myself and others to read, understand and use. Just some food for thought.
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I first was introduced to named parameters when I looked into Objective-C for Cocoa programming. The Ruby way of accepting a hash as a final parameter strikes me as a worthwhile bit of magic (I’m generally against magic, which is why I don’t like Perl). Named parameters are definitely worth the verbosity.
Isn’t this obvious? I use it in any method with either many arguments, or one where many are optional etcetera. Oh, and use “nil” rather than ” :)
Well, the ” is a leftover from PHP and I was just showing a wrong way to do it. That is a good point though as I should have used the more Rubyesque nil than single quotes.
As to the obviousness of writing easy to use code, I don’t believe it is obvious. If it was obvious, all developers would code this way. I’ve downloaded a few RubyForge projects that accept multiple parameters instead of a Hash. That is actually what prompted me to write this article.