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Why does Clojure have “keywords” in addition to “symbols”?

I have a passing knowledge of other Lisps (particularly Scheme) from way back. Recently I've been reading about Clojure . I see that it has both "symbols" and "keywords". Symbols I'm familiar with, but not with keywords. ...
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Stretch background image css?

This is my CSS script 6 Answers 6 ...
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Elastic search, multiple indexes vs one index and types for different data sets?

I have an application developed using the MVC pattern and I would like to index now multiple models of it, this means each model has a different data structure. ...
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Should I pass an std::function by const-reference?

Let's say I have a function which takes an std::function : 3 Answers 3 ...
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Why does casting int to invalid enum value NOT throw exception?

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How to correctly close a feature branch in Mercurial?

I've finished working on a feature branch feature-x . I want to merge results back to the default branch and close feature-x in order to get rid of it in the output of hg branches . ...
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How can I get a Bootstrap column to span multiple rows?

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Pros and cons of AppSettings vs applicationSettings (.NET app.config / Web.config)

When developing a .NET Windows Forms Application we have the choice between those App.config tags to store our configuration values. Which one is better? ...
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Behaviour for significant change location API when terminated/suspended?

This is the section from the CLLocationManager documentation describing the app behavior with startMonitoringSignificantLocationChanges : ...
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When and why would you seal a class?

In C# and C++/CLI the keyword sealed (or NotInheritable in VB) is used to protect a class from any inheritance chance (the class will be non-inheritable). I know that one feature of object-oriented programming is inheritance and I feel that the use of sealed goes against this feature, it stop...