Miscellaneous properties and functions

These utility methods do not fit neatly into the previous categories, but are often very useful when writing scripts using jQuery.

Properties of the jQuery object

Property	Description
$.ready	A promise instance that's resolved as soon as the DOM is ready.

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...