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How to implement the activity stream in a social network

...ling your own, you could look to a third party service used via an API. I started one called Collabinate (http://www.collabinate.com) that has a graph database backend and some fairly sophisticated algorithms for handling large amounts of data in a highly concurrent, high performance manner. While...
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Why is the Java main method static?

...ming Language Concepts - Section 2.17 Execution: The Java virtual machine starts execution by invoking the method main of some specified class and passing it a single argument, which is an array of strings. This causes the specified class to be loaded (§2.17.2), linked (§2.17.3) to other types th...
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How to use unicode characters in Windows command line?

...ppresses the output "Active code page: 65001" you would get every time you start a new command line windows. A full list of all available number you can get from Code Page Identifiers Note, the settings will apply only for the current user. If you like to set it for all users, replace line SET ROO...
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“git rm --cached x” vs “git reset head --​ x”?

... HEAD --mixed and it will "reset" the index to the state it was before you started adding files / adding modifications to the index ( via git add ) In this case, the working copy and the index ( or staging ) were in sync, but you made the HEAD and the index to be in sync after the reset. git rm on ...
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Returning value from called function in a shell script

...d that anyone can use after calling testlock and reset it each time at the start of the method – kisna May 23 at 20:39  |  show 4 more comment...
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git switch branch without discarding local changes

...is trivial: $ git checkout -b develop This creates a new develop branch starting from wherever you are now. Now you can commit and the new stuff is all on develop. You do have a develop. See if Git will let you switch without doing anything: $ git checkout develop This will either succeed, o...
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How do I validate a date string format in python?

...: day is out of range for month dateutil is also extremely useful if you start needing to parse other formats in the future, as it can handle most known formats intelligently and allows you to modify your specification: dateutil parsing examples. It also handles timezones if you need that. Upd...
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How to move files from one git repo to another (not a clone), preserving history

Our Git repositories started out as parts of a single monster SVN repository where the individual projects each had their own tree like so: ...
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What does middleware and app.use actually mean in Expressjs?

... res.send("page render finished"); }); app.listen(port); console.log('start server'); but you can also use another approach and pass each middleware as function arguments. Here is a example from the MooTools Nodejs website where midleware gets the Twitter, Github and Blog flow before the resp...
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What is java interface equivalent in Ruby?

...Here is a simple example that can be improved in many ways to help you get started: class Object def interface(method_hash) obj = new method_hash.each do |k,v| if !obj.respond_to?(k) || !((instance_method(k).arity+1)*-1) raise NotImplementedError, "#{obj.class} must implemen...