[jQuery] [NewBie]Is there something basic functions/classes extension in jQuery, just like Array, String, etc

[jQuery] [NewBie]Is there something basic functions/classes extension in jQuery, just like Array, String, etc

I know that prototype extends built-in classes , just like array,
string, etc, so many things can be easily processed. Does jquery has
the same things? I can only found that the API seems aimed to jQuery
instance, and there are no more extensions applied to built-in
classes.
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