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Run a callback only if an attribute has changed in Rails

...66231 44.6595 4.66231C43.6264 4.66231 43.1481 5.28821 43.1481 6.59048V11.9512C43.1481 13.2535 43.6264 13.8962 44.6595 13.8962C45.6924 13.8962 46.1709 13.2535 46.1709 11.9512V9.17788Z\"/\u003e\u003cpath d=\"M32.492 10.1419C32.492 12.6954 34.1182 14.0484 37.0451 14.0484C39.9723 14.0484 41.5985 12.6954...
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d3 axis labeling

... answered Jun 25 '12 at 18:18 mbostockmbostock 49k1010 gold badges172172 silver badges129129 bronze badges ...
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Running shell command and capturing the output

... 1205 The answer to this question depends on the version of Python you're using. The simplest appro...
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Simplest/Cleanest way to implement singleton in JavaScript?

...een the two. – mlibby Feb 25 '13 at 12:52  |  show 12 more comments ...
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Rails 3: I want to list all paths defined in my rails application

... Yangshun Tay 26.8k2121 gold badges8787 silver badges114114 bronze badges answered Sep 7 '15 at 11:16 AnwarAnwar ...
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Difference between a Postback and a Callback

...ted. – Ryan Doherty Dec 14 '08 at 7:12 1 It's when a pointer to a function gets passed to another...
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How can I convert a file pointer ( FILE* fp ) to a file descriptor (int fd)?

...66231 44.6595 4.66231C43.6264 4.66231 43.1481 5.28821 43.1481 6.59048V11.9512C43.1481 13.2535 43.6264 13.8962 44.6595 13.8962C45.6924 13.8962 46.1709 13.2535 46.1709 11.9512V9.17788Z\"/\u003e\u003cpath d=\"M32.492 10.1419C32.492 12.6954 34.1182 14.0484 37.0451 14.0484C39.9723 14.0484 41.5985 12.6954...
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Left-pad printf with spaces

... 128 If you want the word "Hello" to print in a column that's 40 characters wide, with spaces paddi...
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How to move a git repository into another directory and make that directory a git repository?

... rm -rf gitrepo1/.git # Or (look further here: http://stackoverflow.com/q/1209999/912144) $ git archive --format=tar --remote=<repository URL> HEAD | tar xf - Once you create newrepo, the destination to put gitrepo1 could be anywhere, even inside newrepo if you want it. It doesn't change ...
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Expansion of variables inside single quotes in a command in Bash

... answered Dec 10 '12 at 14:00 Jo SoJo So 19.1k66 gold badges3232 silver badges5454 bronze badges ...