Recursively Flatten an Array

recursive_flatten_method.rb

def recursive_flatten(incoming_array, new_flattened_array = [])
  incoming_array.each do |item|
    if item.class == Array
      # Recursion
      recursive_flatten(item, new_flattened_array)
    else
      new_flattened_array << item
    end
  end
  new_flattened_array
end

henrys_array = [[5,6],1,2,3,[2,[3,4],4]]
puts recursive_flatten(henrys_array)