← Back toFront-end Tips

Use short-circuits conditionals

Written byPhuoc Nguyen
27 Feb, 2021
If you want to execute a function when a condition matches, then use short-circuit to shorten the code:
if (formValid) {

// Use short-circuit
formValid && submitForm();
The logical OR operator `||` is used in a simliar way:
!formValid || submitForm();
In the modern web frameworks, we can use the similar syntax to render a given component when a condition satisfies. The following sample code gives you the idea of conditional rendering in React:
unreadMessages.length > 0 && <div>You have {unreadMessages.length} unread messages.</div>;

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 🥷.

Recent posts ⚡

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