Array functions in jQuery

jQuery has very limited array functions since JavaScript has most of them itself. But here are the ones they have: Utilities - jQuery API.

Have a look at https://developer.mozilla.org/En/Core_JavaScript_1.5_Reference/Global_Objects/Array for documentation on JavaScript Arrays.
jQuery is a library which adds some magic to JavaScript which is a capable and featurefull scripting language. The libraries just fill in the gaps - get to know the core!