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Index on multiple columns in Ruby on Rails
I'm implementing functionality to track which articles a user has read.
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How can I determine whether a Java class is abstract by reflection
I am interating through classes in a Jar file and wish to find those which are not abstract. I can solve this by instantiating the classes and trapping InstantiationException but that has a performance hit as some classes have heavy startup. I can't find anything obviously like isAbstract() in the C...
Differences between contentType and dataType in jQuery ajax function
I have the following Jquery callback function and I have a litle doubt about it (I don't know very well Jquery):
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Why do Objective-C files use the .m extension?
...y they have chosen the extension .m for the implementation files - was it supposed to mean something, or was it just a random letter?
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Android: What is android.R.id.content used for?
Anybody could explain the meaning of "android.R.id.content" ?
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MySQL: Selecting multiple fields into multiple variables in a stored procedure
Can I SELECT multiple columns into multiple variables within the same select query in MySQL?
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Real-world applications of zygohistomorphic prepromorphisms
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Sharon Curtis and Shin-Cheng Mu have a Functional Pearl using zygomorphisms to find maximally dense segments (a generalization of maximum segment sums). Zygomorphisms are seemingly a good fit for sliding window problems once you are ...
Is there a way to use two CSS3 box shadows on one element?
I'm trying to replicate a button style in a Photoshop mock-up that has two shadows on it. The first shadow is an inner lighter box shadow (2px), and the second is a drop shadow outside the button (5px) itself.
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What are the Dangers of Method Swizzling in Objective-C?
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I think this is a really great question, and it's a shame that rather than tackling the real question, most answers have skirted the issue and simply said not to use swizzling.
Using method sizzling is like using sharp knives in the kitchen. So...
Select second last element with css
I already know of :last-child. But is there a way to select the div:
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