iep.ex

def increase_element_priority([], _, _), do: []
def increase_element_priority(queue, {item, prio} = elem, new_prio) 
																										when new_prio >= prio do
	pos 			 = position_by_order queue, elem 
	first_half = (queue |> Enum.take(pos)) -- [elem]
	sec_half 	 = queue 	|> Enum.slice(pos, length(queue))

	first_half ++ [{item, new_prio}] ++ sec_half
end