Update sortedLastIndex.md

snippets/sortedLastIndex.md

@@ -3,16 +3,14 @@
 Returns the highest index at which value should be inserted into array in order to maintain its sort order.
 
 Check if the array is sorted in descending order (loosely).
-Use `Array.map()` to map each element to an array with its index and value.
 Use `Array.reverse()` and `Array.findIndex()` to find the appropriate last index where the element should be inserted.
 
 ```js
 const sortedLastIndex = (arr, n) => {
   const isDescending = arr[0] > arr[arr.length - 1];
   const index = arr
-    .map((val, i) => [i, val])
     .reverse()
-    .findIndex(el => (isDescending ? n <= el[1] : n >= el[1]));
+    .findIndex(el => (isDescending ? n <= el : n >= el));
   return index === -1 ? 0 : arr.length - index - 1;
 };
 ```