Determine whether or not the list has any callbacks attached. If a callback is provided as an argument, determine whether it is in a list.


Finds the elements of an array which satisfy a filter function. The original array is not affected.


Sorts an array of DOM elements, in place, with the duplicates removed. Note that this only works on arrays of DOM elements, not strings or numbers.

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 when they are no longer needed internally to improve page startup performance. For your own project’s feature-detection needs, we strongly recommend the use of an external library such as Modernizr instead of dependency on properties in