Use the strict equality operator when comparing variables

Written byPhuoc Nguyen

Tags

JavaScript

Created

25 Feb, 2021

When checking whether two given variables equal to each other, always use the strict equality (`===`) instead of the equality (`==`) operator.

The `===` operator not only checks the values, but also the types of variables. It's safer then `==` which performs type conversions before comparing the values.

0 == false; // true
0 === false; // false

0 == []; // true
0 === []; // false

0 == ''; // true
0 === ''; // false

You can take a look at == vs === to see more examples.

Questions? 🙋

Do you have any questions? Not just about this specific post, but about any topic in front-end development that you'd like to learn more about? If so, feel free to send me a message on Twitter or send me an email. You can find them at the bottom of this page.

I have a long list of upcoming posts, but your questions or ideas for the next one will be my top priority. Let's learn together! Sharing knowledge is the best way to grow 🥷.

Newsletter 🔔

If you're into front-end technologies and you want to see more of the content I'm creating, then you might want to consider subscribing to my newsletter.

By subscribing, you'll be the first to know about new articles, products, and exclusive promotions.

Don't worry, I won't spam you. And if you ever change your mind, you can unsubscribe at any time.

Phước Nguyễn

Use the strict equality operator when comparing variables

Questions? 🙋

Recent posts ⚡

Newsletter 🔔