Learning jQuery 3 - Fifth Edition

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 callback 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.