From 7ced55f5c64aedc028d56f40a21fae34a0910315 Mon Sep 17 00:00:00 2001
From: "exercism-solutions-syncer[bot]"
 <211797793+exercism-solutions-syncer[bot]@users.noreply.github.com>
Date: Tue, 12 Aug 2025 13:58:40 +0000
Subject: [PATCH] [Sync Iteration] elixir/sublist/1

---
 solutions/elixir/sublist/1/lib/sublist.ex | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 solutions/elixir/sublist/1/lib/sublist.ex

diff --git a/solutions/elixir/sublist/1/lib/sublist.ex b/solutions/elixir/sublist/1/lib/sublist.ex
new file mode 100644
index 0000000..e762c37
--- /dev/null
+++ b/solutions/elixir/sublist/1/lib/sublist.ex
@@ -0,0 +1,20 @@
+defmodule Sublist do
+  @doc """
+  Returns whether the first list is a sublist or a superlist of the second list
+  and if not whether it is equal or unequal to the second list.
+  """
+  def compare(a, a), do: :equal
+  def compare(a, b) do
+    cond do
+      sublist?(a, b) -> :sublist
+      sublist?(b, a) -> :superlist
+      true -> :unequal
+    end
+  end
+
+  defp sublist?(a, a), do: true
+  defp sublist?(a, b) when length(a) > length(b), do: false
+  defp sublist?(a, [_ | b_tail] = b) do
+    if List.starts_with?(b, a), do: true, else: sublist?(a, b_tail)
+  end
+end