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How do I prevent the iPhone screen from dimming or turning off while my application is running?

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Change a Rails application to production

...ct, rails s, and get a development version of your app at http://something.com:3000. Production mode is a little trickier to configure. I've been messing around with this for a while, so I figured I'd write this up for the newbies (such as myself). There are a few little tweaks which are spread thr...
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Remove all child elements of a DOM node in JavaScript

...to this answer used firstChild, but this is updated to use lastChild as in computer-science, in general, it's significantly faster to remove the last element of a collection than it is to remove the first element (depending on how the collection is implemented). The loop continues to check for first...
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How to remove last n characters from every element in the R vector

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How do I make my string comparison case insensitive?

I created a Java program to compare two strings: 12 Answers 12 ...
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Why is Scala's immutable Set not covariant in its type?

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What is the fundamental difference between WebSockets and pure TCP?

... and I wonder why browser couldn't simply open trivial TCP connection and communicate with server like any other desktop application. And why this communication is possible via websockets? ...
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How do I call setattr() on the current module?

... it would have destroyed the single most important optimization the Python compiler does: a function's local variables are not kept in a dict, they're in a tight vector of values, and each local variable access uses the index in that vector, not a name lookup. To defeat the optimization, forcing the...
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Print function log /stack trace for entire program using firebug

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Xcode 4 - detach the console/log window

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