refactor: Refactor Feed component to functional with hooks

webclient/src/Feed.js

@@ -1,28 +1,22 @@
-import React from 'react';
+import React, { useState, useEffect } from 'react';
 import { Link } from 'react-router-dom';
 import { Helmet } from 'react-helmet';
 import localForage from 'localforage';
 import { sourceLink, infoLine, logos } from './utils.js';
 
-class Feed extends React.Component {
-	constructor(props) {
-		super(props);
+function Feed({ updateCache }) {
+	const [stories, setStories] = useState(() => JSON.parse(localStorage.getItem('stories')) || false);
+	const [error, setError] = useState(false);
 
-		this.state = {
-			stories: JSON.parse(localStorage.getItem('stories')) || false,
-			error: false,
-		};
-	}
-
-	componentDidMount() {
+	useEffect(() => {
 		fetch('/api')
 			.then(res => res.json())
 			.then(
 				(result) => {
-					const updated = !this.state.stories || this.state.stories[0].id !== result.stories[0].id;
+					const updated = !stories || stories[0].id !== result.stories[0].id;
 					console.log('updated:', updated);
 
-					this.setState({ stories: result.stories });
+					setStories(result.stories);
 					localStorage.setItem('stories', JSON.stringify(result.stories));
 
 					if (updated) {
@@ -33,21 +27,17 @@ class Feed extends React.Component {
 								.then(result => {
 									localForage.setItem(x.id, result.story)
 										.then(console.log('preloaded', x.id, x.title));
-									this.props.updateCache(x.id, result.story);
+									updateCache(x.id, result.story);
 								}, error => {}
 							);
 						});
 					}
 				},
 				(error) => {
-					this.setState({ error: true });
+					setError(true);
 				}
 			);
-	}
-
-	render() {
-		const stories = this.state.stories;
-		const error = this.state.error;
+	}, [updateCache]);
 
 	return (
 		<div className='container'>
@@ -79,7 +69,6 @@ class Feed extends React.Component {
 			}
 		</div>
 	);
-	}
 }
 
 export default Feed;