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Automatic Retina images for web sites

... There is a new attribute for the img tag that allows you to add a retina src attribute, namely srcset. No javascript or CSS needed, no double loading of images. <img src="low-res.jpg" srcset="high-res.jpg 2x"> Browser Support: http://caniuse.com/#search=srcset O...
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How to determine if one array contains all elements of another array

... Perhaps this is easier to read: a2.all? { |e| a1.include?(e) } You can also use array intersection: (a1 & a2).size == a1.size Note that size is used here just for speed, you can also do (slower): (a1 & a2) == a1 But I guess the first is more re...
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How do I find numeric columns in Pandas?

Let's say df is a pandas DataFrame. I would like to find all columns of numeric type. Something like: 11 Answers ...
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load scripts asynchronously

...time to load. it will be nice if I can display the loader before importing all the: 19 Answers ...
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How to log PostgreSQL queries?

How to enable logging of all SQL executed by PostgreSQL 8.3? 10 Answers 10 ...
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Days between two dates? [duplicate]

...est for calendar checks. from datetime import timedelta, datetime def cal_days_diff(a,b): A = a.replace(hour = 0, minute = 0, second = 0, microsecond = 0) B = b.replace(hour = 0, minute = 0, second = 0, microsecond = 0) return (A - B).days if __name__ == '__main__': x = datetime...
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Where does PostgreSQL store the database?

...here the data directory is, use this query. show data_directory; To see all the run-time parameters, use show all; You can create tablespaces to store database objects in other parts of the filesystem. To see tablespaces, which might not be in that data directory, use this query. SELECT * FRO...
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How do I setup a SSL certificate for an express.js server?

... Other options for createServer are at: http://nodejs.org/api/tls.html#tls_tls_createserver_options_secureconnectionlistener share | improve this answer | follow ...
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Render Partial View Using jQuery in ASP.NET MVC

... You can't render a partial view using only jQuery. You can, however, call a method (action) that will render the partial view for you and add it to the page using jQuery/AJAX. In the below, we have a button click handler that loads the url for the action from a data attribute on the button and...
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Copying text with color from Notepad++

... There's a plugin called NppExport that does just that in a couple of available formats. If you don't have NppExport yet, you can download it through the inbuilt plugin manager. update As of version 6.1.5 (or maybe earlier) this ships with a s...