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Why is extending native objects a bad practice?

Every JS opinion leader says that extending the native objects is a bad practice. But why? Do we get a perfomance hit? Do they fear that somebody does it "the wrong way", and adds enumerable types to Object , practically destroying all loops on any object? ...
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How does a language expand itself? [closed]

I am learning C++ and I've just started learning about some of Qt 's capabilities to code GUI programs. I asked myself the following question: ...
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How can I return two values from a function in Python?

I would like to return two values from a function in two separate variables. For example: 8 Answers ...
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Where do “pure virtual function call” crashes come from?

I sometimes notice programs that crash on my computer with the error: "pure virtual function call". 8 Answers ...
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Array to Hash Ruby

Okay so here's the deal, I've been googling for ages to find a solution to this and while there are many out there, they don't seem to do the job I'm looking for. ...
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Remove the last three characters from a string

I want to remove last three characters from a string: 14 Answers 14 ...
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Would you, at present date, use JBoss or Glassfish (or another) as Java EE server for a new project?

If you started a new Java EE project today which is to be finished in about a year, which application server would you choose and why? ...
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How to check if a float value is a whole number

I am trying to find the largest cube root that is a whole number, that is less than 12,000. 13 Answers ...
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How to set a Header field on POST a form?

How can I set a custom field in POST header on submit a form? 8 Answers 8 ...
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Show a popup/message box from a Windows batch file

Is there a way to display a message box from a batch file (similar to how xmessage can be used from bash-scripts in Linux)? ...