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What is the .idea folder?

When I create a project in JetBrains WebStorm, a folder called .idea gets created. Is it okay if I delete it? Will it affect my project? ...
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How can I get nth element from a list?

... Personally I can't comprehend how an at-index accessor that doesn't return a Maybe type is acceptable as idiomatic Haskell. [1,2,3]!!6 will give you a runtime error. It could very easily be avoided if !! had the type [a] -> Int ...
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Best way to select random rows PostgreSQL

...lass WHERE oid = 'schema_name.big'::regclass; As long as ct isn't much smaller than id_span, the query will outperform other approaches. WITH params AS ( SELECT 1 AS min_id -- minimum id <= current min id , 5100000 AS id_span -- rounded up. (max_id - m...
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How can I delete all Git branches which have been merged?

...anches which have already been merged? Is there an easy way to delete them all instead of deleting them one by one? 45 Answ...
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pandas dataframe columns scaling with sklearn

...and I'd like to apply sklearn's min_max_scaler to some of the columns. Ideally, I'd like to do these transformations in place, but haven't figured out a way to do that yet. I've written the following code that works: ...
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How to master AngularJS? [closed]

...The hitchhiker's guide to the directive Project structure - Check out this app Angular-UI - Must use components for any UI development UI-Bootstrap - From-scratch JS re-implementations of bootstrap components as AngularJS directives Full-Spectrum Testing with AngularJS and Karma Bonus - Data binding...
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Constants in Objective-C

... Overall, great answer, with one glaring caveat: you DO NOT want to test for string equality with the == operator in Objective-C, since it tests memory address. Always use -isEqualToString: for this. You can easily get a different...
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RSS Feeds in ASP.NET MVC

... Here is what I recommend: Create a class called RssResult that inherits off the abstract base class ActionResult. Override the ExecuteResult method. ExecuteResult has the ControllerContext passed to it by the caller and with this you can get the data and content type...
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Pass an array of integers to ASP.NET Web API?

...iptor.GetConverter(elementType); var values = Array.ConvertAll(s.Split(new[] { ","},StringSplitOptions.RemoveEmptyEntries), x => { return converter.ConvertFromString(x != null ? x.Trim() : x); }); var typedValues = Array.CreateInstance(elementT...
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Why must a lambda expression be cast when supplied as a plain Delegate parameter

...o by x to be? Yes, the compiler could generate a new delegate type with an appropriate signature, but that's rarely useful and you end up with less opportunity for error checking. If you want to make it easy to call Control.Invoke with an Action the easiest thing to do is add an extension method to...