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Node.js + Express: Routes vs controller

New to Node.js and Express, I am trying to understand the two seems overlapping concepts, routes vs controller. 2 Answers ...
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How to remove all rows in a numpy.ndarray that contain non-numeric values

Basically, I'm doing some data analysis. I read in a dataset as a numpy.ndarray and some of the values are missing (either by just not being there, being NaN , or by being a string written " NA "). ...
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How to export plots from matplotlib with transparent background?

I am using matplotlib to make some graphs and unfortunately I cannot export them without the white background. 2 Answers ...
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How do I clone a subdirectory only of a Git repository?

I have my Git repository which, at the root, has two sub directories: 18 Answers 18 ...
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How to write UPDATE SQL with Table alias in SQL Server 2008?

I have a very basic UPDATE SQL - 2 Answers 2 ...
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Node.JS constant for platform-specific new line?

Is there a constant available in Node.JS for a newline character that is specific to the platform the application is running on? ...
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How to check if a column exists in Pandas

Is there a way to check if a column exists in a Pandas DataFrame? 3 Answers 3 ...
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UML class diagram enum

I am modeling a class diagram. An attribute of a class is an enumeration. How do I model this? Normally you do something like this: ...
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Open an IO stream from a local file or url

I know there are libs in other languages that can take a string that contains either a path to a local file or a url and open it as a readable IO stream. ...
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Changing case in Vim

Is there a command in Vim that changes the case of the selected text? 2 Answers 2 ...