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WebRTC vs Websockets: If WebRTC can do Video, Audio, and Data, why do I need Websockets? [closed]

So I'm looking to build a chat app that will allow video, audio, and text. I spent some time researching into Websockets and WebRTC to decide which to use. Since there are plenty of video and audio apps with WebRTC, this sounds like a reasonable choice, but are there other things I should consider? ...
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How to [recursively] Zip a directory in PHP?

... $file = str_replace('\\', '/', $file); // Ignore "." and ".." folders if( in_array(substr($file, strrpos($file, '/')+1), array('.', '..')) ) continue; $file = realpath($file); if (is_dir($file) === true) { ...
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Google Guava isNullOrEmpty for collections

... No, this method does not exist in Guava and is in fact in our "idea graveyard." We don't believe that "is null or empty" is a question you ever really want to be asking about a collection. If a collection might be null, and null should be treated the same as empt...
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IE7 does not understand display: inline-block

... working fine but with Internet Explorer 7 its not. It seems not to understand the display: inline-block; . 4 Answers ...
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Transport endpoint is not connected

...ving me this Transport endpoint is not connected error on my mount point and the only thing that seems to fix it is rebooting. ...
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Throwing exceptions from constructors

...ing a debate with a co-worker about throwing exceptions from constructors, and thought I would like some feedback. 10 Answe...
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When should I use the Visitor Design Pattern? [closed]

...dmit, I just don't get it. I read the wikipedia article for the pattern and I understand its mechanics but I'm still confused as to when I'd use it. ...
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JavaScript: Create and save file [duplicate]

I have data that I want to write to a file, and open a file dialog for the user to choose where to save the file. It would be great if it worked in all browsers, but it has to work in Chrome. I want to do this all client-side. ...
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Batch Renaming of Files in a Directory

... Such renaming is quite easy, for example with os and glob modules: import glob, os def rename(dir, pattern, titlePattern): for pathAndFilename in glob.iglob(os.path.join(dir, pattern)): title, ext = os.path.splitext(os.path.basename(pathAndFilename)) o...
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How can I use “sizeof” in a preprocessor macro?

... ((void)sizeof(... it errors with expected identifier or '(' before 'void' and expected ')' before 'sizeof'. But in principle size_t x = (sizeof(... instead does work as intended. You have to "use" the result, somehow. To allow for this to be called multiple times either inside a function or at gl...