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Arrays union intersection and difference

suggest change 
x = [5, 5, 1, 3]
y = [5, 2, 4, 3]

Union (|) contains elements from both arrays, with duplicates removed: 

x | y
=> [5, 1, 3, 2, 4]

Intersection (&) contains elements which are present both in first and second array: 

x & y
=> [5, 3]

Difference (\-) contains elements which are present in first array and not present in second array: 

x - y
=> [1]
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Arrays:
* Arrays
* Create Array of Strings
* Create Array with Array new
* Create Array of Symbols
* Manipulating Array Elements
* Accessing elements
* Creating an Array with the literal constructor
* Decomposition
* Arrays union intersection and difference
* Two-dimensional array
* Inject reduce
* Filtering arrays
* Arrays and the splat operator
* map
* Turn multi-dimensional array into a one-dimensional flattened array
* Get unique array elements
* Get all combinations permutations of an array
* Remove all nil elements from an array with compact
* Create an Array of consecutive numbers or letters
* Create Array of numbers
* Cast to Array from any object
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