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A quick and easy way to join array elements with a separator (the opposite of split) in Java [duplic

See Related .NET question 15 Answers 15 ...
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Should it be “Arrange-Assert-Act-Assert”?

Regarding the classic test pattern of Arrange-Act-Assert , I frequently find myself adding a counter-assertion that precedes Act. This way I know that the passing assertion is really passing as the result of the action. ...
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Creating a comma separated list from IList or IEnumerable

What is the cleanest way to create a comma-separated list of string values from an IList<string> or IEnumerable<string> ? ...
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No Multiline Lambda in Python: Why not?

I've heard it said that multiline lambdas can't be added in Python because they would clash syntactically with the other syntax constructs in Python. I was thinking about this on the bus today and realized I couldn't think of a single Python construct that multiline lambdas clash with. Given that ...
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Why is inserting in the middle of a linked list O(1)?

According to the Wikipedia article on linked lists , inserting in the middle of a linked list is considered O(1). I would think it would be O(n). Wouldn't you need to locate the node which could be near the end of the list? ...
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Why should I declare a virtual destructor for an abstract class in C++?

I know it is a good practice to declare virtual destructors for base classes in C++, but is it always important to declare virtual destructors even for abstract classes that function as interfaces? Please provide some reasons and examples why. ...
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Check if a folder exist in a directory and create them using C#

How can I check if directory C:/ contains a folder named MP_Upload , and if it does not exist, create the folder automatically? ...
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How to scale Docker containers in production

So I recently discovered this awesome tool, and it says 10 Answers 10 ...
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Why do I get a “Null value was assigned to a property of primitive type setter of” error message whe

I get the following error when using a primitive attribute in my grails domain object: 12 Answers ...
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How do I obtain a Query Execution Plan in SQL Server?

In Microsoft SQL Server how can I get a query execution plan for a query / stored procedure? 12 Answers ...