Ruby: Flatten Arrays

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#  1. Create a function to flatten the below array by one dimension
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#    oneDimensionalArray = [1, [2, 3, [4, 5]]]
#
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#  2. Create a function to flatten the below array n times.
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#     nTimesArray = [1, [2, 3, [4, [5, 6]]]]
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#  3. Create a function to flatten the below array using recursion.
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#     arrayWithRecursion = [1, [2, 3, [4, [5, 6]]]]
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