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JavaScript - cannot set property of undefined

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What is the difference between

Can some one please describe the usage of the following characters which is used in ERB file: 7 Answers ...
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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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Android - get children inside a View?

Given a View how can I get the child views inside it? 8 Answers 8 ...
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When to use UICollectionView instead of UITableView?

I found that UICollectionView is like an upgraded version of UITableView introduced in iOS6, but when should I choose UICollectionView instead of UITableView ? ...
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Make a Bash alias that takes a parameter?

I used to use CShell ( csh ), which lets you make an alias that takes a parameter. The notation was something like 20 Answe...
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How to swap keys and values in a hash

How do I swap keys and values in a Hash? 6 Answers 6 ...
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CSS attribute selector does not work a href

I need to use attribute selector in css to change link on different color and image, but it does not work. 2 Answers ...
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What is the difference between old style and new style classes in Python?

What is the difference between old style and new style classes in Python? When should I use one or the other? 8 Answers ...
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Can someone explain Microsoft Unity?

I've been reading the articles on MSDN about Unity (Dependency Injection, Inversion of Control), but I think I need it explained in simple terms (or simple examples). I'm familiar with the MVPC pattern (we use it here), but I just can't really grasp this Unity thing yet, and I think it's the next st...