Fibonacci Generator using a GenServer
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defmodule Fib do | |
use GenServer | |
def init(_args), do: {:ok, %{0 => 0, 1 => 1}} | |
def handle_call(:get, _from, state), do: {:reply, state, state} | |
def handle_call({:get, number}, _from, state), do: {:reply, state[number], state} | |
def handle_cast({:compute, number}, state) do | |
last = Map.keys(state) |> Enum.max() | |
new_state = | |
(last + 1)..number | |
|> Enum.reduce(state, fn i, intermediate -> | |
Map.put(intermediate, i, intermediate[i - 1] + intermediate[i - 2]) | |
end) | |
{:noreply, new_state} | |
end | |
end |
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