From 984227e4ecac3e2f552b119a3cc37cf3bbeb6c71 Mon Sep 17 00:00:00 2001
From: lee <lee-dasilva@hotmail.com>
Date: Thu, 27 Jan 2022 18:34:19 +0000
Subject: [PATCH] fix to manipulate-key

---
 subjects/manipulate-keys/README.md | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/subjects/manipulate-keys/README.md b/subjects/manipulate-keys/README.md
index 1b32ced0d..19c764c9d 100644
--- a/subjects/manipulate-keys/README.md
+++ b/subjects/manipulate-keys/README.md
@@ -10,6 +10,21 @@ Create 3 functions that works like the `.filter`, `.map` and `.reduce` array met
 - `mapKeys` changes the name of the items you have.
 - `reduceKeys` reducing you grocery cart.
 
+### Examples
+
+```js
+const nutrients = { carbohydrates: 12, protein: 20, fat: 5 }
+console.log(filterKeys(nutrients, (key) => /protein/.test(key)))
+// output :
+// { protein: 20 }
+console.log(mapKeys(nutrients, (k) => `-${k}`))
+// output :
+// { -carbohydrates: 12, -protein: 20, -fat: 5 }
+console.log(reduceKeys(nutrients, (acc, cr) =>acc.concat(', ', cr)))
+// output :
+// carbohydrates, protein, fat
+```
+
 ### Notions
 
 - [devdocs.io/javascript/global_objects/array/filter](https://devdocs.io/javascript/global_objects/array/filter)