jQuery.map() vs jQuery.each()

Difference between jQuery .map and .each

S.No	jQuery.map()	jQuery.each()
1	Used as: The map method can be used as an iterator.	Used as: The each method is meant to be used as an immutable iterator.
2	What it returns ? Map function returns a new array	What it returns ? Each function returns the original array.
3	Callback arguments used: map(arr, function(elem, index) {});	Callback arguments used: each(arr, function(index, elem) {});

Note: If we overuse the return value of the map function we can potentially waste a lot of memory.

Reference: http://niroze.wordpress.com/2012/06/27/difference-between-jquery-map-and-each/