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Queue_Static.ex
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39 lines (33 loc) · 1.01 KB
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defmodule Queue do
def initialize(max) do
[elements: [], max: max]
end
def enqueue(queue, element) do
if length(queue[:elements]) < queue[:max], do:
queue = List.keyreplace(queue, :elements, 0, {:elements, queue[:elements] ++ [element]})
queue
end
def dequeue(queue) do
if length(queue[:elements]) > 0 do
{n, elements} = List.pop_at(queue[:elements], 0)
queue = List.keyreplace(queue, :elements, 0, {:elements, elements})
{:ok, queue, n}
else
{:error, queue, nil}
end
end
end
queue = Queue.initialize(5)
queue = Queue.enqueue(queue, 1)
queue = Queue.enqueue(queue, 2)
queue = Queue.enqueue(queue, 3)
queue = Queue.enqueue(queue, 4)
queue = Queue.enqueue(queue, 5)
# queue = Queue.enqueue(queue, 6)
{:ok, queue, n1} = Queue.dequeue(queue)
{:ok, queue, n2} = Queue.dequeue(queue)
{:ok, queue, n3} = Queue.dequeue(queue)
{:ok, queue, n4} = Queue.dequeue(queue)
{:ok, queue, n5} = Queue.dequeue(queue)
# {:error, queue, nil} = Queue.dequeue(queue)
IO.inspect queue