.find()

Get the descendants of each element in the current set of matched elements, filtered by a selector, jQuery object, or element.

.css()

Get the value of a computed style property for the first element in the set of matched elements or set one or more CSS properties for every matched element.

jQuery.grep()

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

.promise()

Return a Promise object to observe when all actions of a certain type bound to the collection, queued or not, have finished.