Ever wondered why some sites loads slow when you first visit them, but after loading the full page when you get back the next time the site loads instantly fast, in today’s guide I will be walking you through the beauty of service worker by demonstr...

Closure In JavaScript is a function that retains access to variables from its outer scope, even after the outer function has finished executing. This definition may seem complicated at the first, but don’t worry in this article— we will Learn how Ja...