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What is the purpose of the var keyword and when should I use it (or omit it)?

What exactly is the function of the var keyword in JavaScript, and what is the difference between 19 Answers ...
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What are the differences between numpy arrays and matrices? Which one should I use?

What are the advantages and disadvantages of each? 5 Answers 5 ...
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Detect if an input has text in it using CSS — on a page I am visiting and do not control?

... input has text in it via CSS? I've tried using the :empty pseudo-class, and I've tried using [value=""] , neither of which worked. I can't seem to find a single solution to this. ...
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“No X11 DISPLAY variable” - what does it mean?

...erent userid, this will fail. If you're coming in from another machine, and you're at the main display of that machine and it's running X, then you can use "ssh -X hostname" to connect to that host, and ssh will forward the X display back. ssh will also make sure that the DISPLAY environment var...
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What are the differences between mocks and stubs on Rhino Mocks?

I haven't play enough with this and usually use mocks, but I wonder what are the differences between this two and when to use one or the other on Rhino Mocks. ...
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virtualenv --no-site-packages and pip still finding global packages?

...on that virtualenv --no-site-packages would create a completely separate and isolated Python environment, but it doesn't seem to. ...
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Programmatically Lighten or Darken a hex color (or rgb, and blend colors)

...ecific amount. Just pass in a string like "3F6D2A" for the color ( col ) and a base10 integer ( amt ) for the amount to lighten or darken. To darken, pass in a negative number (i.e. -20 ). ...
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Container-fluid vs .container

Just downloaded 3.1 and found in the docs... 8 Answers 8 ...
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Positioning element at center of screen

...creen irrespective of screen size. In other words, the space left on 'top' and 'bottom' should be equal and space left on 'right' and 'left' sides should be equal. I would like to accomplish this with only CSS. ...
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AngularJS routing without the hash '#'

I'm learning AngularJS and there's one thing that really annoys me. 10 Answers 10 ...