At Rubrik, we've had great success using Storybook(https://storybook.js.org/) as a tool for developing components in isolation. Developing components in isolation helps you test all the edge cases that are hard to reach in the main project environment.

https://web.dev/ is a great place to learn web performance tuning.

There is no way to do this yourself. The Hashnode support team will do it for you if you send an email to hello@hashnode.com with the new username and the new blog URL. I did this last week.

All you need to know about working with JSON in JavaScript is well documented on MDN - https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Objects/JSON. To solve the questions similar to the one you've mentioned, learn about array methods like map, filter, and reduce.