Recursive Custom Array Flatter

gistfile1.txt

def recursive_custom_array_flat(elem, flatten_array=[])
  return elem if elem.is_a? Integer
  
  elem.each do |value|
    recursive_return = recursive_custom_array_flat(value, flatten_array)
    flatten_array << recursive_return unless recursive_return.is_a? Array
  end
  
  flatten_array 
end