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Why are variables “i” and “j” used for counters?

...ation notation traditionally uses i for the first index, j for the second, and so on. Example (from http://en.wikipedia.org/wiki/Summation): It's also used that way for collections of things, like if you have a bunch of variables x1, x2, ... xn, then an arbitrary one will be known as xi. As...
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onclick() and onblur() ordering issue

...g the browser automatically re-order based on the priority of these event handlers, without any additional work from me. Is there any reason why this wouldn't have also worked for you? share | impr...
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How does `scp` differ from `rsync`?

...n these tools is how they copy files. scp basically reads the source file and writes it to the destination. It performs a plain linear copy, locally, or over a network. rsync also copies files locally or over a network. But it employs a special delta transfer algorithm and a few optimizations to m...
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apc vs eaccelerator vs xcache

Im doing research on which one of these to use and I can't really find one that stands out. Eaccelerator is faster than APC , but APC is better maintained. Xcache is faster but the others have easier syntax. ...
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Can I run multiple versions of Google Chrome on the same machine? (Mac or Windows)

...iple Chrome versions, side-by-side. This answer quotes my original answer, and includes a script which does the job for you. Quoted from: section 7 of Cross-browser testing: All major browsers on ONE machine: Chrome: Stand-alone installers can be downloaded from File Hippo. It is also pos...
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Difference between webdriver.Dispose(), .Close() and .Quit()

...ked in the source code for the Selenium Client & WebDriver C# Bindings and found the following. webDriver.Close() - Close the browser window that the driver has focus of webDriver.Quit() - Calls Dispose() webDriver.Dispose() Closes all browser windows and safely ends the session The ...
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What's the difference between ES6 Map and WeakMap?

Looking this and this MDN pages it seems like the only difference between Maps and WeakMaps is a missing "size" property for WeakMaps. But is this true? What's the difference between them? ...
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Passing parameters to a Bash function

...h function, but what comes up is always how to pass parameter from the command line. 7 Answers ...
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UITextView style is being reset after setting text property

I have UITextView *_masterText and after call method setText property font is being reset. It's happening after I change sdk 7. _masterText is IBOutlet , global and properties are set in storyboard. It's only me or this is general SDK bug? ...
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What is the difference between graph search and tree search?

What is the difference between graph search and tree search versions regarding DFS, A* searches in artificial intelligence ? ...