2016 Update

Task/Averages-Simple-moving-average/Elixir/averages-simple-moving-average-1.elixir

@@ -0,0 +1,42 @@
+$ cat simple-moving-avg.exs
+#!/usr/bin/env elixir
+
+defmodule Math do
+  def average([]), do: nil
+  def average(enum) do
+    Enum.sum(enum) / length(enum)
+  end
+end
+
+defmodule SMA do
+
+  def sma(l, p \\ 10) do
+    IO.puts("\nSimple moving average(period=#{p}):")
+    Enum.chunk(l, p, 1)
+    |> Enum.map(&(%{"input": &1, "avg": Float.round(Math.average(&1), 3)}))
+  end
+
+  defmacro gen_func(p) do
+    quote do
+      fn l -> SMA.sma(l, unquote(p)) end
+    end
+  end
+
+  def read_numeric_input do
+    IO.stream(:stdio, :line)
+    |> Enum.map(&(String.split(&1, ~r{\s+})))
+    |> List.flatten()
+    |> Enum.reject(&(is_nil(&1) || String.length(&1) == 0))
+    |> Enum.map(&(Integer.parse(&1) |> elem(0)))
+  end
+
+  def run do
+    sma_func_10 = gen_func(10)
+    sma_func_15 = gen_func(15)
+    numbers = read_numeric_input
+    sma_func_10.(numbers) |> IO.inspect
+    sma_func_15.(numbers) |> IO.inspect
+  end
+end
+
+SMA.run

Task/Averages-Simple-moving-average/Elixir/averages-simple-moving-average-2.elixir

@@ -0,0 +1,5 @@
+#!/bin/bash
+elixir ./simple-moving-avg.exs <<EOF
+1 2 3 4 5 6 7 8 9 8 7 6 5 4 3 2 1
+2 4 6 8 10 12 14 12 10 8 6 4 2
+EOF