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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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How do I manually create a file with a . (dot) prefix in Windows? For example, .htaccess

I want to create a .htaccess file manually and discovered it seems impossible through the Windows UI. I get a "you must type a filename." message. There has to be a way to create files with . as a prefix in Windows. ...
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Scala Doubles, and Precision

...likely, I'd say. Anything involving grids or finance can require rounding and also performance. – Rex Kerr Jun 19 '12 at 20:33 ...
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指定组件的大小 · App Inventor 2 中文网

...he designer, you are typically given the opportunity to specify its height and width. There are four choices: Automatic: Size is chosen by the system Fill parent: Size is chosen to fill the space available. Size specified in pixels Size in percent of Screen (not available for all componen...
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Converting from longitude\latitude to Cartesian coordinates

I have some earth-centered coordinate points given as latitude and longitude ( WGS-84 ). 9 Answers ...
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fatal: could not read Username for 'https://github.com': No such file or directory

...y added 'origin github'. I removed the origin [ git remote remove origin ] and then wrote what is in the answer with my username and password and it worked fine. – P_Rein Jun 4 '14 at 13:11 ...
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Update Row if it Exists Else Insert Logic with Entity Framework

...or a while? For example, during the life of a Windows form? I normally try and clean up database objects to ensure minimum load on the database. Is there no problem waiting to destroy my EF context? – Jonathan Wood Apr 6 '11 at 2:16 ...
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How to manually create icns files using iconutil?

...: Use iconutil to Create an icns File Manually The iconutil command-line tool converts iconset folders to deployment-ready, high-resolution icns files. (You can find complete documentation for this tool by entering man iconutil in Terminal.) Using this tool also compresses the resulting i...
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Image Segmentation using Mean Shift explained

Could anyone please help me understand how Mean Shift segmentation actually works? 2 Answers ...
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Can I install/update WordPress plugins without providing FTP access?

... has write access to the necessary files, it will take care of the updates and installation automatically. This method does not require you to have FTP/SFTP or SSH access, but it does require your to have specific file permissions set up on your webserver. It will try various methods in order, and ...