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What is the difference D3 datum vs. data?

Can someone please explain the difference between datum() and data() in D3.js? I see both being used and I am not sure why you should choose one over the other? ...
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How to override trait function and call it from the overridden function?

Scenario: 5 Answers 5 ...
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How to get a random number in Ruby

How do I generate a random number between 0 and n ? 17 Answers 17 ...
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Django using get_user_model vs settings.AUTH_USER_MODEL

Reading the Django Documentation: 5 Answers 5 ...
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Wait until file is unlocked in .NET

What's the simplest way of blocking a thread until a file has been unlocked and is accessible for reading and renaming? For example, is there a WaitOnFile() somewhere in the .NET Framework? ...
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Why use symbols as hash keys in Ruby?

A lot of times people use symbols as keys in a Ruby hash. 4 Answers 4 ...
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Async call with await in HttpClient never returns

I have a call I am making from inside a xaml-based, C# metro application on the Win8 CP; this call simply hits a web service and returns JSON data. ...
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Rounding DateTime objects

I want to round dates/times to the nearest interval for a charting application. I'd like an extension method signature like follows so that the rounding can be acheived for any level of accuracy: ...
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Difference between a clickable ImageView and ImageButton

I'm just wondering if there is any significant difference between an ImageView that's set to be clickable, compared with an ImageButton ? ...
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Vim: Move window left/right?

In Vim, is it possible to “move” a window to the left or right? Eg, similar to <c-w> r or <c-w> x , but left/right instead of up/down? ...