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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.
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