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Eval

By Stephen Chapman, About.com

Definition: The Eval built-in function is used to evaluate whatever is passed to it and then to run it. This allows you to use Javascript to dynamically build the Javascript code that is to be run next. This is not a reserved word so you can declare your own variable or function called Eval but if you do then you will not be able to use the built-in function.
Examples:
eval('jim[x] = john' + x);
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