Check to see if an object is empty (contains no enumerable properties). As of jQuery 1.4 this method

Merge the contents of two or more objects together into the first object. When two or more object

Return a number representing the current time. The $.now() method is a shorthand for

Remove the whitespace from the beginning and end of a string. The $.trim() function

Merge the contents of two arrays together into the first array. The $.merge() operation

Check to see if a DOM element is a descendant of another DOM element. The $.contains()

A collection of properties that represent the presence of different browser features or bugs. Intended for jQuery's internal use; specific properties may be removed

Parses a string into an XML document. jQuery.parseXML uses the native parsing function

Determine if the argument passed is a JavaScript function object. Note: As of jQuery