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How do I “source” something in my .vimrc file?

I've been working on expanding my vim-foo lately and I've run across a couple of plugins ( autotag.vim for example) that require them to be "sourced" in my .vimrc file. What exactly does this mean and how do I do it? ...
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Which characters are valid/invalid in a JSON key name?

Are there any forbidden characters in key names, for JavaScript objects or JSON strings? Or characters that need to be escaped? ...
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What is the best way to use a HashMap in C++?

I know that STL has a HashMap API, but I cannot find any good and thorough documentation with good examples regarding this. ...
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Correct use of flush() in JPA/Hibernate

I was gathering information about the flush() method, but I'm not quite clear when to use it and how to use it correctly. From what I read, my understanding is that the contents of the persistence context will be synchronized with the database, i. e. issuing outstanding statements or refreshing enti...
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Rails 3 check if attribute changed

Need to check if a block of attributes has changed before update in Rails 3. 5 Answers ...
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@UniqueConstraint and @Column(unique = true) in hibernate annotation

What is difference between @UniqueConstraint and @Column(unique = true) ? 4 Answers ...
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Regex: Specify “space or start of string” and “space or end of string”

Imagine you are trying to pattern match "stackoverflow". 4 Answers 4 ...
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How to check if element is visible after scrolling?

I'm loading elements via AJAX. Some of them are only visible if you scroll down the page. Is there any way I can know if an element is now in the visible part of the page? ...
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Split array into chunks

Let's say that I have an Javascript array looking as following: 57 Answers 57 ...
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How to randomly pick an element from an array

I am looking for solution to pick number randomly from an integer array. 12 Answers 12...