Miscellaneous properties and functions in jQuery ​

These utility methods are often very useful when writing scripts using jQuery.

Properties of the jQuery object ​

Properties of the jQuery object

Property

Description

$.support

Returns an object containing properties indicating whether the browser supports various feactures and standards.

Arrays and objects ​

Arrays and objects

Function

Description

$.each(collection, callback)

Iterates over collection, executing callback for each item.

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

Modifies the object target by adding properties from the other supplied objects.

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

Filters array by using calback as a test.

$.makeArray(object)

Converts object into an array.

$.map(array, callback)

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

$.inArray(value, array)

Determines whether value is in array.

$.merge(array1, array2)

Combines the contents of array1 and array2.

$.unique(array)

Removes any duplicate DOM elements from array.

Object introspection ​

Object introspection

Function

Description

$.isArray(object)

Determines whether object is a true JavaScript array.

$.isEmptyObject(object)

Determines whether object is empty.

$.isFunction(obejct)

Determines whether object is a function.

$.isPlainObject(object)

Determines whether object was created as an object literal or with new object.

$.isNumeric(object)

Determines whether object is a numeric scalar value.

$.isWindow(object)

Determines whether object is an XML node.

$.isXMLDoc(object)

Determines whether object is an XML node.

$.type(object)

Gets the JavaScript class of object.

Other ​

Other

Function

Description

$.trim(string)

Removes whitespace from the ends of string.

$.noConflict([removeAll])

Reverts $ to its pre-jQuery definition.

$.noop()

A function that does nothing.

$.now()

The current time in milliseconds since the epoch.

$.holdReady(hold)

Stops the ready event from being triggered, or releases this hold.