working with rss feeds in node js

1/*
2    This code comes from Vincent Lab
3    And it has a video version linked here: https://www.youtube.com/watch?v=sL6SgDEHH00
4*/
5
6// Import dependencies
7const fs = require("fs");
8const Parser = require("rss-parser");
9
10(async function main() {
11
12    // Make a new RSS Parser
13    const parser = new Parser();
14
15    // Get all the items in the RSS feed
16    const feed = await parser.parseURL("https://www.youtube.com/feeds/videos.xml?channel_id=UCMA8gVyu_IkVIixXd2p18NQ"); // https://www.reddit.com/.rss
17
18    let items = [];
19
20    // Clean up the string and replace reserved characters
21    const fileName = `${feed.title.replace(/\s+/g, "-").replace(/[/\\?%*:|"<>]/g, '').toLowerCase()}.json`;
22
23    if (fs.existsSync(fileName)) {
24        items = require(`./${fileName}`);
25    }
26
27    // Add the items to the items array
28    await Promise.all(feed.items.map(async (currentItem) => {
29
30        // Add a new item if it doesn't already exist
31        if (items.filter((item) => isEquivalent(item, currentItem)).length <= 0) {
32            items.push(currentItem);
33        }
34
35    }));
36
37    // Save the file
38    fs.writeFileSync(fileName, JSON.stringify(items));
39
40})();
41
42function isEquivalent(a, b) {
43    // Create arrays of property names
44    let aProps = Object.getOwnPropertyNames(a);
45    let bProps = Object.getOwnPropertyNames(b);
46
47    // if number of properties is different, objects are not equivalent
48    if (aProps.length != bProps.length) {
49        return false;
50    }
51
52    for (let i = 0; i < aProps.length; i++) {
53        let propName = aProps[i];
54
55        // if values of same property are not equal, objects are not equivalent
56        if (a[propName] !== b[propName]) {
57            return false;
58        }
59    }
60
61    // if we made it this far, objects are considered equivalent
62    return true;
63}