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React JSX: selecting “selected” on selected option

In a React component for a <select> menu, I need to set the selected attribute on the option that reflects the application state. ...
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rsync: how can I configure it to create target directory on server?

I would like to rsync from local computer to server. On a directory that does not exist, and I want rsync to create that directory on the server first. ...
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TFS: How can you Undo Checkout of Unmodified files in a batch file

We use a batch file to generate code, and it automatically checks out the generated files from Team Foundation Server (TFS) so that it can regenerate them. The majority of these files are not modified, but the generator does not know this ahead of time. ...
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Why '&&' and not '&'?

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Google Maps v3 - limit viewable area and zoom level

is it possible to limit Google map v3 to a certain area? I want to allow displaying only some area (e.g. a country) and disallow the user to slide elsewhere. Also I want to restrict the zoom level - e.g. only between levels 6 and 9. And I want to use all the base map types. ...
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Is there a way to make mv create the directory to be moved to if it doesn't exist?

So, if I'm in my home directory and I want to move foo.c to ~/bar/baz/foo.c , but those directories don't exist, is there some way to have those directories automatically created, so that you would only have to type ...
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JavaScript OR (||) variable assignment explanation

Given this snippet of JavaScript... 12 Answers 12 ...
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Multiple linear regression in Python

I can't seem to find any python libraries that do multiple regression. The only things I find only do simple regression. I need to regress my dependent variable (y) against several independent variables (x1, x2, x3, etc.). ...
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Difference between __str__ and __repr__?

What is the difference between __str__ and __repr__ in Python? 23 Answers 23 ...
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How do you trigger a block after a delay, like -performSelector:withObject:afterDelay:?

Is there a way to call a block with a primitive parameter after a delay, like using performSelector:withObject:afterDelay: but with an argument like int / double / float ? ...