---
title: "Discussion on \"The Crucial Role of \"Key\" in Array Mapping\" | Hashnode"
description: "Discussion on \"The Crucial Role of \"Key\" in Array Mapping\". Mastering Keys in React Array.Map: Best Practices for Efficient Rendering"
url: "https://hashnode.com/posts/the-crucial-role-of-key-in-array-mapping/64586a517f8da72f69e0838b"
---

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# [The Crucial Role of "Key" in Array Mapping](https://explainlikeiamfive.hashnode.dev/the-crucial-role-of-key-in-array-mapping?utm_source=hashnode&utm_medium=feed)

Mastering Keys in React Array.Map: Best Practices for Efficient Rendering

May 8, 2023 · 5 min read · explainlikeiamfive.hashnode.dev  
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## Written by

[Chaitanya Joshi](https://hashnode.com/@chaitanyaJ)

@chaitanyaJ · Nashik, India

  
[View profile](https://hashnode.com/@chaitanyaJ)

A frontend developer having passion for designs, first-principles and problem-solving

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