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What's the difference between using “let” and “var”?

I've heard it that it's described as a local variable, but I'm still not quite sure how it behaves differently than the var keyword. ...
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sed edit file in place

I am trying to find out if it is possible to edit a file in a single sed command without manually streaming the edited content into a new file and then renaming the new file to the original file name. I tried the -i option but my Solaris system said that -i is an illegal option. Is there a d...
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Detect if a page has a vertical scrollbar?

...e overflow property of the body is set to hidden somewhere along the line, it won't work. Setting hidden on a body is extremely rare, though. – Pekka Jan 27 '10 at 12:57 ...
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How does `is_base_of` work?

...heck, both versions are viable because Host can be converted to D* and B*. It's a user defined conversion sequence as described by 13.3.3.1.2 from Host<B, D> to D* and B* respectively. For finding conversion functions that can convert the class, the following candidate functions are synthesize...
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Tri-state Check box in HTML?

... Edit — Thanks to Janus Troelsen's comment, I found a better solution: HTML5 defines a property for checkboxes called indeterminate See w3c reference guide. To make checkbox appear visually indeterminate set it to true: ele...
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Metadata file '.dll' could not be found

...blem. Visual Studio isn't building the project that's being referenced. Written Instructions: Right click on the solution and click Properties. Click Configuration on the left. Make sure the check box under "Build" for the project it can't find is checked. If it is already checked, uncheck, hit a...
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How can I preview a merge in git?

I have a git branch (the mainline, for example) and I want to merge in another development branch. Or do I? 11 Answers ...
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What does glLoadIdentity() do in OpenGL?

I'm new to OpenGL and I'm a little overwhelmed with all of the random functions that I have in my code. They work and I know when to use them, but I don't know why I need them or what they actually do. ...
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Is it possible to use Razor View Engine outside asp.net

... is not particularly tied to generating html. So I wonder, how easy would it be to use the engine outside asp.net in a "normal" .net environment for example to generate text, code,... ...
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What exactly does += do in python?

I need to know what += does in python. It's that simple. I also would appreciate links to definitions of other short hand tools in python. ...