Follow

Keep Up to Date with the Most Important News

By pressing the Subscribe button, you confirm that you have read and are agreeing to our Privacy Policy and Terms of Use
Contact

Define variable and check if it's null at once in Javascript

Is it possible simplify this

var element = document.getElementById('myElement');
if(element)
  element.addEventListener('click', (e) => { ... });

into something like this?

if(var element = document.getElementById('myElement'))
  element.addEventListener('click', (e) => { ... });

Thank you.

MEDevel.com: Open-source for Healthcare and Education

Collecting and validating open-source software for healthcare, education, enterprise, development, medical imaging, medical records, and digital pathology.

Visit Medevel

>Solution :

You can use optional chaining.

The ?. operator is like the . chaining operator, except that instead of causing an error if a reference is nullish (null or undefined), the expression short-circuits with a return value of undefined.

document.getElementById('myElement')?.addEventListener('click', (e) => { ... });
Add a comment

Leave a Reply

Keep Up to Date with the Most Important News

By pressing the Subscribe button, you confirm that you have read and are agreeing to our Privacy Policy and Terms of Use

Discover more from Dev solutions

Subscribe now to keep reading and get access to the full archive.

Continue reading