Filter elements using Puppeteer

Let's assume that you want to filter some elements using Puppeteer.

As an example, we'll filter links on a website which have href equal to a certain string:

javascript
// Defining the string to filter the results
let urlToFilter  = 'https://elonmusk.com';

// Getting all the <a></a> elements of a website
let urlsToVisit  = await page.$$eval('a', (links, urlToFilter) => links.map(link => link.href).filter(link => link.startsWith(urlToFilter)), urlToFilter);  

Remember that you need to pass the variable to filter as an argument to the page.$$eval() function. Otherwise, the variable will be defined in the Node context but it'll be undefined in the browser context (you won't filter the results).