recusive.rb

def acquire_values_recursively(list_node, val_array=[])
  return [] if list_node.nil?
  val_array << list_node.value
  unless list_node.next_node.nil?
    acquire_values_recursively(list_node.next_node, val_array)
  end
  return val_array
end

- compared to -

def acquire_values_recursively(list_node, val_array=[])
  return [] if list_node.nil?
  if list_node.next_node.nil?
    val_array << list_node.value
    return val_array
  else
    val_array << list_node.value
    acquire_values_recursively(list_node.next_node, val_array)
  end
  return val_array
end

Nice, I like the optimization. Thanks!

The only reason I kept it in there is because it throws a stack error if there is an infinite list to match a test. I should have thrown the test out, but sometimes bubbling a payload up the stack with desired ordering is tricky and nice to demonstrate.