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JavaScript: empty array, [ ] evaluates to true in conditional structures. Why is this?

I was encountering a lot of bugs in my code because I expected this expression: 2 Answers ...
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How to forward declare a C++ template class?

Given a template class like the following: 3 Answers 3 ...
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Postgresql aggregate array

Hi I have a two tables 4 Answers 4 ...
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What exactly do the Vagrant commands do?

There is surprisingly no documentation on what the Vagrant commands do, other than references throughout the "getting started" tutorial. ...
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HTML img scaling

I'm trying to display some large images with HTML img tags. At the moment they go off the edge of the screen; how can I scale them to stay within the browser window? ...
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How to say “should_receive” more times in RSpec

I have this in my test 4 Answers 4 ...
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What are detached, persistent and transient objects in hibernate?

What are detached, persistent and transient objects in hibernate? Please explain with an example. 5 Answers ...
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Grepping a huge file (80GB) any way to speed it up?

This has been running for an hour on a fairly powerful linux server which is otherwise not overloaded. Any alternative to grep? Anything about my syntax that can be improved, (egrep,fgrep better?) ...
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How can I select all elements without a given class in jQuery?

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AddBusinessDays and GetBusinessDays

I need to find 2 elegant complete implementations of 15 Answers 15 ...