What's the Problem?

Before exploring a solution, it's important to first understand the concrete problem.

Actions that are not directly related to producing a (new) user interface state often clash with React's component rendering cycle. They may introduce bugs or even break the entire web app.

Consider the following example code snippet:

import { useState } from 'react';
import classes from './BlogPosts.module.css';
async function fetchPosts() {
  const response = await fetch('https://jsonplaceholder.typicode.com/posts');
  const blogPosts = await response.json();
  return blogPosts;
}
function BlogPosts() {
  const [loadedPosts, setLoadedPosts] = useState([]);
  fetchPosts().then((fetchedPosts) => setLoadedPosts(fetchedPosts));
  return (
    <ul className={classes.posts}>
      {loadedPosts.map((post) =>...