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javascript set a variable if undefined

I know that I can test for a javascript variable and then define it if it is undefined, but is there not some way of saying ...
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Can I specify multiple users for myself in .gitconfig?

In my ~/.gitconfig , I list my personal email address under [user] , since that's what I want to use for Github repos. 20...
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Convert date to datetime in Python

Is there a built-in method for converting a date to a datetime in Python, for example getting the datetime for the midnight of the given date? The opposite conversion is easy: datetime has a .date() method. ...
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Why doesn't indexOf work on an array IE8?

The below function works fine on Opera, Firefox and Chrome. However, in IE8 it fails on the if ( allowed.indexOf(ext[1]) == -1) part. ...
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Make xargs handle filenames that contain spaces

My command fails because the file "Lemon Tree.mp3" contains spaces and so xargs thinks it's two files. Can I make find + xargs work with filenames like this? ...
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Why a function checking if a string is empty always returns true? [closed]

I have a function isNotEmpty which returns true if the string is not empty and false if the string is empty. I've found out that it is not working if I pass an empty string through it. ...
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Format a number as 2.5K if a thousand or more, otherwise 900

I need to show a currency value in the format of 1K of equal to one thousand, or 1.1K, 1.2K, 1.9K etc, if its not an even thousands, otherwise if under a thousand, display normal 500, 100, 250 etc, using javascript to format the number? ...
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C++ auto keyword. Why is it magic?

From all the material I used to learn C++, auto has always been a weird storage duration specifier that didn't serve any purpose. But just recently, I encountered code that used it as a type name in and of itself. Out of curiosity I tried it, and it assumes the type of whatever I happen to assig...
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How can I determine if a .NET assembly was built for x86 or x64?

I've got an arbitrary list of .NET assemblies. 15 Answers 15 ...
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Truncating floats in Python

I want to remove digits from a float to have a fixed number of digits after the dot, like: 29 Answers ...