---
title: "Understanding the difference between useMemo and useCallback"
url: https://daily.dev/posts/understanding-the-difference-between-usememo-and-usecallback-dsh2ziss3
source_url: https://medium.com/@sveta.slepner/understanding-the-difference-between-usememo-and-usecallback-ec956adb2004
type: article
source: "gitconnected"
published: 2020-09-07T03:35:25.479Z
updated: 2021-10-07T14:17:10.317Z
tags: ["react"]
reading_time: 4
upvotes: 15
comments: 3
language: en
---

> ## Documentation Index
> Fetch the complete documentation index at: https://daily.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Understanding the difference between useMemo and useCallback

**[gitconnected](https://daily.dev/sources/gc)** · 4 min read · 15 upvotes · 3 comments

## Summary

React provides us with two built-in hooks to optimize the performance of our app. At first glance, it might look like their usage is quite similar, so it can get confusing about when to use each. To clear that confusion, let’s dig in and understand the actual difference and the correct way to use them both.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://medium.com/@sveta.slepner/understanding-the-difference-between-usememo-and-usecallback-ec956adb2004>

## Community discussion

Top comments from developers on daily.dev.

**@sshanzel** · 7 upvotes

> useMemo - Returns the value or reference returned by the callback itself.
>
> useCallback - Returns the callback itself.
>
> When any of the dependencies change:
> - useMemo: will recompute the value or reference it returns (callback will be triggered).
> - useCallback: will recreate the callback itself.

**@elonmusk** · 0 upvotes

> there should be a save button here also @admin

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---

Tags: [#react](https://daily.dev/tags/react)

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