Array prototype extensions

Extends array prototype with the following methods: contains, every, exfiltrate, filter, forEach, getRange, inArray, indexOf, insertAt, map, randomize, removeAt, some, unique

This extensions doesn't depend on any other code or overwrite existing methods.

Methods

contains
every
exfiltrate
filter
forEach
getRange
inArray
indexOf
insertAt
map
randomize
removeAt
some
unique

contains(Array elements) : Boolean
Returns true if every element in 'elements' is in the array.
Example:
```
[1, 2, 1, 4, 5, 4].contains([1, 2, 4]);
```
Result:
```
true
```

every( , ) :

Tests whether all elements in the array pass the test implemented by the provided function.

Example:

[22, 72, 16, 99, 254].every(function(element, index, array) {
	  return element >= 15;
	});

Result:

true;

Example:

[12, 72, 16, 99, 254].every(function(element, index, array) {
	  return element >= 15;
	});

Result:

false;

exfiltrate(Array elements) : Boolean
Returns the array without the elements in 'elements'.
Example:
```
[1, 2, 1, 4, 5, 4].contains([1, 2, 4]);
```
Result:
```
true
```
filter(Function fn, Object scope) : Array
Creates a new array with all elements that pass the test implemented by the provided function.

Natively supported in Gecko since version 1.8.
Example:
```
[12, 5, 8, 1, 44].filter(function(element, index, array) {
	  return element >= 10;
	});
```
Result:
```
[12, 44];
```
forEach(Function fn, Object scope) : void
Executes a provided function once per array element.

Natively supported in Gecko since version 1.8. http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Objects:Array:forEach
Example:
```
var stuff = "";
	["Java", "Script"].forEach(function(element, index, array) {
	  stuff += element;
	});
```
Result:
```
"JavaScript";
```
getRange(Number startIndex, Number endIndex) : Array
Returns a range of items in this collection
Example:
```
[1, 2, 1, 4, 5, 4].getRange(2, 4);
```
Result:
```
[1, 4, 5]
```
inArray(Object subject) : Boolean
Checks if a given subject can be found in the array.
Example:
```
[12, 5, 7, 5].inArray(7);
```
Result:
```
true;
```
Example:
```
[12, 5, 7, 5].inArray(9);
```
Result:
```
false;
```
indexOf(Object subject, Number offset) : Int
Returns the first index at which a given element can be found in the array, or -1 if it is not present.
Example:
```
[12, 5, 8, 5, 44].indexOf(5);
```
Result:
```
1;
```
Example:
```
[12, 5, 8, 5, 44].indexOf(5, 2);
```
Result:
```
3;
```
insertAt(Number index, Object element) : Array
Inserts an item at the specified index in the array.
Example:
```
['dog', 'cat', 'horse'].insertAt(2, 'mouse');
```
Result:
```
['dog', 'cat', 'mouse', 'horse']
```
map(Function fn, Object scope) : Array
Creates a new array with the results of calling a provided function on every element in this array.

Natively supported in Gecko since version 1.8. http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Objects:Array:map
Example:
```
["my", "Name", "is", "HARRY"].map(function(element, index, array) {
	  return element.toUpperCase();
	});
```
Result:
```
["MY", "NAME", "IS", "HARRY"];
```
Example:
```
[1, 4, 9].map(Math.sqrt);
```
Result:
```
[1, 2, 3];
```
randomize() : Array
Randomize the order of the elements in the Array.
Example:
```
[2, 3, 4, 5].randomize();
```
Result:
```
[5, 2, 3, 4] randomized result
```
removeAt(Number index) : Array
Remove an item from a specified index in the array.
Example:
```
['dog', 'cat', 'mouse', 'horse'].deleteAt(2);
```
Result:
```
['dog', 'cat', 'horse']
```
some(Function fn, Object scope) : Boolean
Tests whether some element in the array passes the test implemented by the provided function.

Natively supported in Gecko since version 1.8. http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Objects:Array:some
Example:
```
[101, 199, 250, 200].some(function(element, index, array) {
	  return element >= 100;
	});
```
Result:
```
true;
```
Example:
```
[101, 99, 250, 200].some(function(element, index, array) {
	  return element >= 100;
	});
```
Result:
```
false;
```
unique() : Array
Returns a new array that contains all unique elements of this array.
Example:
```
[1, 2, 1, 4, 5, 4].unique();
```
Result:
```
[1, 2, 4, 5]
```