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What does “abstract over” mean?

Often in the Scala literature, I encounter the phrase "abstract over", but I don't understand the intent. For example , Martin Odersky writes ...
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How to go to a specific file in Chrome Developer Tools?

I am developing a web application with a heavy front-end approach. By using Dojo and the AMD-way, I currently have testing screens which may easily load over a hundred different javascript files. ...
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How would you implement an LRU cache in Java?

Please don't say EHCache or OSCache, etc. Assume for purposes of this question that I want to implement my own using just the SDK (learning by doing). Given that the cache will be used in a multithreaded environment, which datastructures would you use? I've already implemented one using LinkedHashM...
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Chrome developer tools: View Console and Sources views in separate views/vertically tiled?

Chrome developer tools: Is there a way to view the Console tab and the Sources tab in separate views? I often want to look at both of these simultaneously. ...
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Unsigned keyword in C++

Does the unsigned keyword default to a specific data type in C++? I am trying to write a function for a class for the prototype: ...
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Showing Difference between two datetime values in hours

I am retrieving two date time values from the database. Once the value is retrieved, I need the difference between the two values. For that, I create a timespan variable to store the difference of the 2 date values. ...
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How does one make random number between range for arc4random_uniform()?

so my goal in this codebit is to randomly roll two dice and as we all know your regular die only has 6 sides so I imported Foundation for access to arc4random_uniform(UInt32). I attempted using the range of (1..7) to avoid randomly getting 0 however that returned an error which I didn't enjoy too mu...
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How can I check for an empty/undefined/null string in JavaScript?

I saw this question , but I didn't see a JavaScript specific example. Is there a simple string.Empty available in JavaScript, or is it just a case of checking for "" ? ...
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Is it possible to group projects in Eclipse?

Is it possible to group projects in Eclipse? Or maybe have a project with sub-projects? 6 Answers ...
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Show an image preview before upload

In my HTML form I have input filed with type file for example : 5 Answers 5 ...