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What is the difference between Fragment and FragmentActivity?

My question is apart from the obvious inheritance differences, what are the main differences between Fragment and FragmentActivity ? To what scenarios are each class best suited? I'm trying to get an understanding of why both of these classes exist... ...
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Print array to a file

...var_export or set print_r to return the output instead of printing it. Example from PHP manual $b = array ( 'm' => 'monkey', 'foo' => 'bar', 'x' => array ('x', 'y', 'z')); $results = print_r($b, true); // $results now contains output from print_r You can then save $result...
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Process all arguments except the first one (in a bash script)

I have a simple script where the first argument is reserved for the filename, and all other optional arguments should be passed to other parts of the script. ...
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MongoDB atomic “findOrCreate”: findOne, insert if nonexistent, but do not update

as the title says, I want to perform a find (one) for a document, by _id, and if doesn't exist, have it created, then whether it was found or was created, have it returned in the callback. ...
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How to Test a Concern in Rails

Given that I have a Personable concern in my Rails 4 application which has a full_name method, how would I go about testing this using RSpec? ...
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Swift equivalent for MIN and MAX macros

In C / Objective-C it is possible to find the minimum and maximum value between two numbers using MIN and MAX macros. Swift doesn't support macros and it seems that there are no equivalents in the language / base library. Should one go with a custom solution, maybe based on generics like this one ?...
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Can I make 'git diff' only the line numbers AND changed file names?

This question calls for "line numbers", if you do not care about line numbers in the output see this question and answer. 1...
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What is a “first chance exception”?

... a first chance exception? How and where does it originate in a .NET program? And why is it called by that peculiar name (what 'chance' are we talking about)? ...
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Access parent DataContext from DataTemplate

I have a ListBox which binds to a child collection on a ViewModel. The listbox items are styled in a datatemplate based on a property on the parent ViewModel: ...
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How can I get the sha1 hash of a string in node.js?

I'm trying to create a websocket server written in node.js 5 Answers 5 ...