From e4d09202ab7d3b0a4bc52213858ce939b0a2a6dd Mon Sep 17 00:00:00 2001
From: Sebastian <s@porto5.com>
Date: Thu, 17 Dec 2020 14:57:08 +1100
Subject: Add list.permutations

---
 test/gleam/list_test.gleam | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'test')

diff --git a/test/gleam/list_test.gleam b/test/gleam/list_test.gleam
index ff94c3b..d9a4285 100644
--- a/test/gleam/list_test.gleam
+++ b/test/gleam/list_test.gleam
@@ -481,3 +481,26 @@ pub fn partition_test() {
   |> list.partition(int.is_odd)
   |> should.equal(tuple([1, 3, 5, 7], [2, 4, 6]))
 }
+
+pub fn permutations_test() {
+  [1, 2]
+  |> list.permutations
+  |> should.equal([[1, 2], [2, 1]])
+
+  let expected = [
+    [1, 2, 3],
+    [1, 3, 2],
+    [2, 1, 3],
+    [2, 3, 1],
+    [3, 1, 2],
+    [3, 2, 1],
+  ]
+
+  [1, 2, 3]
+  |> list.permutations
+  |> should.equal(expected)
+
+  ["a", "b"]
+  |> list.permutations
+  |> should.equal([["a", "b"], ["b", "a"]])
+}
-- 
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