ran npm run tester -> logged invertKeyValues test are invalid

test/sortedLastIndex/sortedLastIndex.js

@@ -0,0 +1,9 @@
+const sortedLastIndex = (arr, n) => {
+const isDescending = arr[0] > arr[arr.length - 1];
+const index = arr
+.map((val, i) => [i, val])
+.filter(el => (isDescending ? n >= el[1] : n >= el[1]))
+.slice(-1)[0][0];
+return index === -1 ? arr.length : index;
+};
+module.exports = sortedLastIndex