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Ruby: extend self

In Ruby, I understand the basic idea of extend . However, what's happening in this segment of code? Specifically, what does extend do? Is it just a convenient way of making the instance methods into class methods? Why would you do it this way rather than specifying class methods from the beginnin...
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Can Java 8 code be compiled to run on Java 7 JVM?

Java 8 introduces important new language features such as lambda expressions. 5 Answers ...
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How to get a ListBox ItemTemplate to stretch horizontally the full width of the ListBox?

I want to have the ListItems to extend with their orange background the full width of the Listbox. 6 Answers ...
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Who is “us” and who is “them” according to Git?

After a Git rebase, and in other circumstances, you can find some files marked as deleted by us in the git status report. Who is us according to Git and why? ...
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What is the `data-target` attribute in Bootstrap 3?

Can you tell me what is the system or behavior behind the data-target attribute used by Bootstrap 3? 2 Answers ...
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Why is Double.MIN_VALUE in not negative

Can anyone shed some light on why Double.MIN_VALUE is not actually the minimum value that Doubles can take? It is a positive value, and a Double can of course be negative. ...
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How does deriving work in Haskell?

Algebraic Data Types (ADTs) in Haskell can automatically become instances of some typeclasse s (like Show , Eq ) by deriving from them. ...
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XSD - how to allow elements in any order any number of times?

I am trying to create an XSD, and trying to write the definition with the following requirement: 6 Answers ...
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Align elements side by side

I know this is a rather simple question, but I can't figure it out for the life of me. I have two links which I've applied a background image to. Here's what it currently looks like (apologies for the shadow, just a rough sketch of a button): ...
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Difference between 'self' and 'total' in Chrome CPU Profile of JS

What is the difference between the 'self' and 'total' columns in the Chrome CPU profiling of JS code? 2 Answers ...