From da62efc18b4783db5bc1e62cc2c3ee40d51376e3 Mon Sep 17 00:00:00 2001
From: Isabelle Viktoria Maciohsek <maciv@hotmail.gr>
Date: Mon, 2 Nov 2020 19:40:45 +0200
Subject: [PATCH] Use Set in filterNonUnique

---
 snippets/filterNonUnique.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/snippets/filterNonUnique.md b/snippets/filterNonUnique.md
index 53e5d3b2f..ee290fcc4 100644
--- a/snippets/filterNonUnique.md
+++ b/snippets/filterNonUnique.md
@@ -5,11 +5,12 @@ tags: array,beginner
 
 Creates an array with the non-unique values filtered out.
 
+- Use `new Set()` and the spread operator (`...`) to create an array of the unique values in `arr`.
 - Use `Array.prototype.filter()` to create an array containing only the unique values.
 
 ```js
 const filterNonUnique = arr =>
-  arr.filter(i => arr.indexOf(i) === arr.lastIndexOf(i));
+  [...new Set(arr)].filter(i => arr.indexOf(i) === arr.lastIndexOf(i));
 ```
 
 ```js