The array to flatten.
A flattened array (one level deep).
flattenArray([1, [2, 3], [4, 5]]); // Returns: [1, 2, 3, 4, 5]
flattenArray([[1, 2], [3, 4], [5, 6]]); // Returns: [1, 2, 3, 4, 5, 6]
flattenArray([1, 2, 3]); // Returns: [1, 2, 3]
flattenArray([1, [2, [3, 4]]]); // Returns: [1, 2, [3, 4]]
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Flattens a nested array by one level.