From 61d3e3a29eaad77beef5ef0f349a96d87c76835a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=B5=AA=E6=B5=AA=E6=B5=AA?= <675483520@qq.com>
Date: Fri, 10 Aug 2018 15:47:20 +0800
Subject: [PATCH] Update symmetricDifference

No const
One time new Set()
One line code style
---
 snippets/symmetricDifference.md | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/snippets/symmetricDifference.md b/snippets/symmetricDifference.md
index 6f13806e4..1f76f8f25 100644
--- a/snippets/symmetricDifference.md
+++ b/snippets/symmetricDifference.md
@@ -5,11 +5,9 @@ Returns the symmetric difference between two arrays.
 Create a `Set` from each array, then use `Array.filter()` on each of them to only keep values not contained in the other.
 
 ```js
-const symmetricDifference = (a, b) => {
-  const sA = new Set(a),
-    sB = new Set(b);
-  return [...a.filter(x => !sB.has(x)), ...b.filter(x => !sA.has(x))];
-};
+const symmetricDifference = (a, b) => [
+  ...new Set([...a.filter(v => !b.includes(v)), ...b.filter(v => !a.includes(v))])
+];
 ```
 
 ```js