---
title: "Discussion on \"Map and Set in JavaScript\" | Hashnode"
description: "Discussion on \"Map and Set in JavaScript\". JavaScript already had objects and arrays. So why did ES6 introduce Map and Set? Because objects and arrays have real limitations — and Map and Set were built to solve them specifically."
url: "https://hashnode.com/posts/map-and-set-in-javascript/69fed2f5f239332df45cfba5"
---

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# [Map and Set in JavaScript](https://chetan71.hashnode.dev/map-and-set-in-javascript?utm_source=hashnode&utm_medium=feed)

JavaScript already had objects and arrays. So why did ES6 introduce Map and Set? Because objects and arrays have real limitations — and Map and Set were built to solve them specifically.

May 9 · 11 min read · chetan71.hashnode.dev  
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-   [#map](https://hashnode.com/tag/map)
-   [#set](https://hashnode.com/tag/set)
-   [#map-and-set-in-javascript](https://hashnode.com/tag/map-and-set-in-javascript)
-   [#javascript](https://hashnode.com/tag/javascript)
-   [#beginners](https://hashnode.com/tag/beginners)
-   [#chaicode](https://hashnode.com/tag/chaicode)

## Written by

[Chetan Chauhan](https://hashnode.com/@Chetan71)

@Chetan71 · Delhi, India

  
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Building products with passion

Software developer passionate about building scalable web applications with React and backend technologies. I enjoy solving problems, building projects, and sharing my learning with the community.

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