Ruby Language Arrays Turn multi-dimensional array into a one-dimensional (flattened) array

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[1, 2, [[3, 4], [5]], 6].flatten  # => [1, 2, 3, 4, 5, 6]

If you have a multi-dimensional array and you need to make it a simple (i.e. one-dimensional) array, you can use the #flatten method.

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