$.support

Return a map of properties indicating whether the browser supports various features and standards

$.each(collection, callback)

Iterate over collection, executing callback for each item

$.extend(target, addition, ...)

Modify the object target by adding properties from the other supplied objects

$.grep(array, callback, [invert])

Filter array by using callback as a test

$.makeArray(object)

Convert object into an array

$.map(array, callback)

Construct a new array consisting of the result of callback being called on each item

$.inArray(value, array)

Determine the position of value in array or return -1 if value is not in array

$.merge(array1, array2)

Combine the contents of array1 and array2

$.unique(array)

Remove any duplicate DOM elements from array

$.isArray(object)

Determine whether object is a true JavaScript array

$.isEmptyObject(object)

Determine whether object is empty

$.isFunction(object)

Determine whether object is a function

$.isPlainObject(object)

Determine whether object was created as an object literal or with new Object

$.isWindow(object)

Determine whether object represents a browser window

$.isXMLDoc(object)

Determine whether object is an XML node

$.type(object)

Get the JavaScript class of object

$.trim(string)

Remove whitespace from the ends of string

$.noConflict([removeAll ])

Revert $ to its pre-jQuery definition

$.noop()

A function that does nothing

$.now()

The current time, in seconds since the epoch