Initial data commit

Task/Jewels-and-stones/JavaScript/jewels-and-stones.js

@@ -0,0 +1,16 @@
+(() => {
+
+    // jewelCount :: String -> String -> Int
+    const jewelCount = (j, s) => {
+        const js = j.split('');
+        return s.split('')
+            .reduce((a, c) => js.includes(c) ? a + 1 : a, 0)
+    };
+
+    // TEST -----------------------------------------------
+    return [
+            ['aA', 'aAAbbbb'],
+            ['z', 'ZZ']
+        ]
+        .map(x => jewelCount(...x))
+})();