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flatten 

        # Hash.flatten

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

---

Returns a new Array object that is a 1-dimensional flattening of `self`.

---

By default, nested Arrays are not flattened:
    h = {foo: 0, bar: [:bat, 3], baz: 2}
    h.flatten # => [:foo, 0, :bar, [:bat, 3], :baz, 2]

Takes the depth of recursive flattening from Integer argument `level`:
    h = {foo: 0, bar: [:bat, [:baz, [:bat, ]]]}
    h.flatten(1) # => [:foo, 0, :bar, [:bat, [:baz, [:bat]]]]
    h.flatten(2) # => [:foo, 0, :bar, :bat, [:baz, [:bat]]]
    h.flatten(3) # => [:foo, 0, :bar, :bat, :baz, [:bat]]
    h.flatten(4) # => [:foo, 0, :bar, :bat, :baz, :bat]

When `level` is negative, flattens all nested Arrays:
    h = {foo: 0, bar: [:bat, [:baz, [:bat, ]]]}
    h.flatten(-1) # => [:foo, 0, :bar, :bat, :baz, :bat]
    h.flatten(-2) # => [:foo, 0, :bar, :bat, :baz, :bat]

When `level` is zero, returns the equivalent of #to_a :
    h = {foo: 0, bar: [:bat, 3], baz: 2}
    h.flatten(0) # => [[:foo, 0], [:bar, [:bat, 3]], [:baz, 2]]
    h.flatten(0) == h.to_a # => true

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