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What does addChildViewController actually do?

I'm just dipping my feet for the first time into iOS development, and one of the first things I've had to do is implement a custom container view controller - lets call it SideBarViewController - that swaps out which of several possible child view controllers it shows, almost exactly like a stan...
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Why is whitespace sometimes needed around metacharacters?

A few months ago I tattooed a fork bomb on my arm, and I skipped the whitespaces, because I think it looks nicer without them. But to my dismay, sometimes (not always) when I run it in a shell it doesn't start a fork bomb, but it just gives a syntax error. ...
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Under what conditions is a JSESSIONID created?

...ode calls request.getSession() or request.getSession(true) for the first time. If you just want to get the session, but not create it if it doesn't exist, use request.getSession(false) -- this will return you a session or null. In this case, new session is not created, and JSESSIONID cookie is not s...
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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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Changing the default folder in Emacs

I am fairly new to Emacs and I have been trying to figure out how to change the default folder for C-x C-f on start-up. For instance when I first load Emacs and hit C-x C-f its default folder is C:\emacs\emacs-21.3\bin , but I would rather it be the desktop. I believe there is some way to custo...
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How do I revert a Git repository to a previous commit?

How do I revert from my current state to a snapshot made on a certain commit? 41 Answers ...
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What's the difference between ngModel.$modelValue and ngModel.$viewValue

I have the following ckEditor directive. At the bottom are two variations that I have seen from examples on how to set the data in the editor: ...
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Draw multi-line text to Canvas

A hopefully quick question, but I can't seem to find any examples... I'd like to write multi-line text to a custom View via a Canvas , and in onDraw() I have: ...
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Turn off constraints temporarily (MS SQL)

I'm looking for a way to temporarily turn off all DB's constraints (eg table relationships). 5 Answers ...
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What is the recommended batch size for SqlBulkCopy?

What is the recommended batch size for SqlBulkCopy ? I'm looking for a general formula I can use as a starting point for performance tuning. ...