Prototype Array Methods

Prototype extends all native JavaScript arrays with quite a few powerful methods.
This is done in two ways:
* It mixes in the Enumerable module, which brings a ton of methods in already.
* It adds quite a few extra methods, which are documented in this section.
Using Iterators: Prototype uses java like iterator in JavaScript
myArray.each(function(item) {
// Your code working on item here...
});

Methods	Description
clear()	Clears the array (makes it empty).
clone()	Returns a duplicate of the array, leaving the original array intact.
compact()	Returns a new version of the array, without any null/undefined values.
each()	Iterates over the array in ascending numerical index order.
first()	Returns the first item in the array, or undefined if the array is empty.
flatten()	Returns a "flat" (one-dimensional) version of the array.
from()	Clones an existing array or creates a new one from an array-like collection.
indexOf()	Check if the string is 'blank', meaning either empty or containing only whitespace.
inspect()	Returns the debug-oriented string representation of an array.
last()	Returns the last item in the array, or undefined if the array is empty.
reduce()	Reduces arrays: one-element arrays are turned into their unique element, while multiple-element arrays are returned untouched.
reverse()	Returns the reversed version of the array. By default, directly reverses the original. If inline is set to false, uses a clone of the original array.
size()	Returns the size of the array.
toArray()	This is just a local optimization of the mixed-in toArray from Enumerable.
toJSON()	Returns a JSON string.
uniq()	Produces a duplicate-free version of an array. If no duplicates are found, the original array is returned.
without()	Produces a new version of the array that does not contain any of the specified values.