Why Do We Need Strict Mode in JavaScript?

What is it? What is it for? And why should we use it?

Photo by Pankaj Patel on Unsplash

Strict mode is an important part of modern JavaScript. It is a mode that lets us opt-in to a more restricted syntax of JavaScript.

The semantics of strict mode is different from the old “sloppy mode” of JavaScript that has a looser syntax and makes errors in code that are…