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flatten 

        # Array.flatten

(from ruby core)
---
    array.flatten -> new_array
    array.flatten(level) -> new_array

---

Returns a new Array that is a recursive flattening of `self`:
*   Each non-Array element is unchanged.
*   Each Array is replaced by its individual elements.


With non-negative Integer argument `level`, flattens recursively through
`level` levels:
    a = [ 0, [ 1, [2, 3], 4 ], 5 ]
    a.flatten(0) # => [0, [1, [2, 3], 4], 5]
    a = [ 0, [ 1, [2, 3], 4 ], 5 ]
    a.flatten(1) # => [0, 1, [2, 3], 4, 5]
    a = [ 0, [ 1, [2, 3], 4 ], 5 ]
    a.flatten(2) # => [0, 1, 2, 3, 4, 5]
    a = [ 0, [ 1, [2, 3], 4 ], 5 ]
    a.flatten(3) # => [0, 1, 2, 3, 4, 5]

With no argument, a `nil` argument, or with negative argument `level`,
flattens all levels:
    a = [ 0, [ 1, [2, 3], 4 ], 5 ]
    a.flatten # => [0, 1, 2, 3, 4, 5]
    [0, 1, 2].flatten # => [0, 1, 2]
    a = [ 0, [ 1, [2, 3], 4 ], 5 ]
    a.flatten(-1) # => [0, 1, 2, 3, 4, 5]
    a = [ 0, [ 1, [2, 3], 4 ], 5 ]
    a.flatten(-2) # => [0, 1, 2, 3, 4, 5]
    [0, 1, 2].flatten(-1) # => [0, 1, 2]

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