1 files changed, 33 insertions, 0 deletions
diff --git a/users/wpcarro/assessments/semiprimes/server/lib/server.ex b/users/wpcarro/assessments/semiprimes/server/lib/server.ex
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+++ b/users/wpcarro/assessments/semiprimes/server/lib/server.ex
@@ -0,0 +1,33 @@
+defmodule Server do
+  @moduledoc """
+  Documentation for `Server`.
+  """
+
+  @doc """
+  If `n` contains exactly two prime factors, return those prime factors;
+  otherwise, return nothing.
+  """
+  def semiprime(n) do
+    case Cache.get(n) do
+      nil ->
+        case do_semiprime(n) do
+          nil ->
+            nil
+
+          res ->
+            Cache.put(n, res)
+            {:miss, res}
+        end
+
+      hit ->
+        {:hit, hit}
+    end
+  end
+
+  defp do_semiprime(n) do
+    case Math.factor(n) do
+      [_, _] = res -> res
+      _ -> nil
+    end
+  end
+end