From 84404927105084baae5833482d0b143777bdd6d8 Mon Sep 17 00:00:00 2001
From: Henry <617822642@qq.com>
Date: Sat, 4 May 2019 16:32:47 +0800
Subject: [PATCH] just slice arr once

use variable `rightIndex` to make it more efficient, just slice arr once.
---
 snippets/dropRightWhile.md | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/snippets/dropRightWhile.md b/snippets/dropRightWhile.md
index 48f496f51..4242132da 100644
--- a/snippets/dropRightWhile.md
+++ b/snippets/dropRightWhile.md
@@ -7,8 +7,9 @@ Returns the remaining elements.
 
 ```js
 const dropRightWhile = (arr, func) => {
-  while (arr.length > 0 && !func(arr[arr.length - 1])) arr = arr.slice(0, -1);
-  return arr;
+  let rightIndex = arr.length;
+  while (rightIndex-- && !func(arr[rightIndex]));
+  return arr.slice(0, rightIndex + 1);
 };
 ```