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How to save as a new file and keep working on the original one in Vim?

Whenever I use the :sav command, it saves the file with a new name and opens the new file open in Vim. 4 Answers ...
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Is there any way to use a numeric type as an object key?

It seems that when I use a numeric type as a key name in an object, it always gets converted to a string. Is there anyway to actually get it to store as a numeric? The normal typecasting does not seem to work. ...
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Using @include vs @extend in Sass?

In Sass, I can't quite discern the difference between using @include with a mixin and using @extend with a placeholder class. Don't they amount to the same thing? ...
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IntelliJ Split Window Navigation

If I split the editor window (horizontal or vertical) into N tab groups, how do I switch/toggle from one tab group to another via the keyboard? If all of the tabs are in the same group you can switch from each tab easily (CTRL + right/left arrow), but when they're in separate tab groups I can't. I...
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How to convert a clojure keyword into a string?

In my application I need to convert clojure keyword eg. :var_name into a string "var_name". Any ideas how that could be done? ...
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What is the mouse down selector in CSS?

I have noticed that buttons and other elements have a default styling and behave in 3 steps: normal view, hover/focus view and mousedown/click view, in CSS I can change the styling of normal view and hover view like this: ...
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How do you discover model attributes in Rails?

I am finding it difficult to easily see what attributes/properties exist on all of my model classes since they are not explicitly defined in my class files. ...
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Why are Perl 5's function prototypes bad?

In another Stack Overflow question Leon Timmermans asserted: 4 Answers 4 ...
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Assign width to half available screen width declaratively

Is it possible to assign a widget width to half the available screen width, and do it using declarative xml? 5 Answers ...
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How to exit a function in bash

How would you exit out of a function if a condition is true without killing the whole script, just return back to before you called the function. ...