From 024291e7bc328301332e7aed9f8de4f2f2a53bd9 Mon Sep 17 00:00:00 2001
From: gkucmierz <gkucmierz@gmail.com>
Date: Sun, 17 Sep 2017 19:48:49 +0200
Subject: [PATCH] Which are in?

---
 which-are-in/index.js | 6 ++++++
 1 file changed, 6 insertions(+)
 create mode 100644 which-are-in/index.js

diff --git a/which-are-in/index.js b/which-are-in/index.js
new file mode 100644
index 0000000..68c8dce
--- /dev/null
+++ b/which-are-in/index.js
@@ -0,0 +1,6 @@
+// https://www.codewars.com/kata/which-are-in/train/javascript
+
+function inArray(a1, a2) {
+  let s2 = a2.join('_');
+  return a1.filter(w => 0 <= s2.indexOf(w)).sort((a, b) => a.localeCompare(b));
+}
\ No newline at end of file