---
title: "Discussion on \"Map and Set in JavaScript\" | Hashnode"
description: "Discussion on \"Map and Set in JavaScript\". Objects have string-only keys. Arrays allow duplicates. Map and Set fix these problems. Learn with examples and use cases."
url: "https://hashnode.com/posts/map-and-set-in-javascript/69fe55fff239332df414af51"
---

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# [Map and Set in JavaScript](https://imohit1o1.hashnode.dev/map-and-set-in-javascript?utm_source=hashnode&utm_medium=feed)

Objects have string-only keys. Arrays allow duplicates. Map and Set fix these problems. Learn with examples and use cases.

May 8 · 6 min read · imohit1o1.hashnode.dev  
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[Mohit Kumar](https://hashnode.com/@imohit159)

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