---
title: "Data structures in JavaScript: Dictionaries"
url: https://daily.dev/posts/data-structures-in-javascript-dictionaries-pkcjokkyu
source_url: https://flaviocopes.com/javascript-data-structures-map/
type: article
source: "Flavio Copes"
published: 2020-11-08T07:32:14.176Z
updated: 2021-10-07T14:17:10.317Z
tags: ["general-programming", "javascript", "logging"]
reading_time: 2
upvotes: 16
comments: 1
language: en
---

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# Data structures in JavaScript: Dictionaries

**[Flavio Copes](https://daily.dev/sources/flaviocopes)** · 2 min read · 16 upvotes · 1 comments

## Summary

ES6 introduced the Map data structure, providing us a proper tool to handle this kind of data organization. What is a Map? It's a data structure that allows to associate data to a key. A WeakMap is a special kind of Map that lets all its items be freely collected.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://flaviocopes.com/javascript-data-structures-map/>

## Community discussion

Top comments from developers on daily.dev.

**@amol\_8458** · 0 upvotes

> concise but thorough explanation of maps. Loved it gonna bookmark it

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---

Tags: [#general-programming](https://daily.dev/tags/general-programming), [#javascript](https://daily.dev/tags/javascript), [#logging](https://daily.dev/tags/logging)

[View this post on daily.dev](https://daily.dev/posts/data-structures-in-javascript-dictionaries-pkcjokkyu)