---
title: "React 18 — the trickiness of useEffect"
url: https://daily.dev/posts/react-18-the-trickiness-of-useeffect-fgja8cyt7
source_url: https://levelup.gitconnected.com/react-18-the-trickiness-of-useeffect-fadfa65fa4b4?source=rss----5517fd7b58a6---4
type: article
source: "gitconnected"
published: 2022-05-18T11:49:09.279Z
updated: 2022-05-18T11:49:09.279Z
tags: ["react"]
reading_time: 1
upvotes: 33
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.

# React 18 — the trickiness of useEffect

**[gitconnected](https://daily.dev/sources/gc)** · 1 min read · 33 upvotes · 3 comments

## Summary

React 18 introduces a new development-only check to Strict Mode. This new check automatically unmounts and remounts every component, whenever a component mounts for the first time, restoring the previous state on the second mount. If we used the useEffect() hook like this:.After refreshing the page, the output would be.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://levelup.gitconnected.com/react-18-the-trickiness-of-useeffect-fadfa65fa4b4?source=rss----5517fd7b58a6---4>

## Community discussion

Top comments from developers on daily.dev.

**@kkurko** · 0 upvotes

> Really solid explanation of this new behavior

**@skydiver** · 0 upvotes

> great article, sadly author has few followers

**@greenrenge** · 0 upvotes

> This is a need to know if you write the React

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---

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

[View this post on daily.dev](https://daily.dev/posts/react-18-the-trickiness-of-useeffect-fgja8cyt7)