Flatten Nested Array Structure

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Your question is Flatten Nested Array Structure. Start with the requirements on the right.

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Problem

Given a nested array arr, return a new flat array containing all non-array elements in left-to-right order. Elements may be nested to arbitrary depth, and empty nested arrays should contribute nothing to the result.

Constraints

0 <= len(arr) <= 10^4
Nesting depth is between 0 and 10^3
Elements are either integers or arrays containing the same kinds of values
Preserve the original left-to-right traversal order

Function Signature

def flatten_array(arr):

Your solutionPython 3

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