Skip to content

JavaScript, how to export a function

New Course Coming Soon:

Get Really Good at Git

How to export a function from a JavaScript file

In JavaScript we can separate a program into separate files. How do we make a function we define in a file available to other files?

You typically write a function, like this:

function sum(a, b) {
  return a + b

and you can make it available for any other file using this syntax:

export default sum

We call it a default export.

The files that need the function exported will import it using this syntax:

import sum from 'myfile'
Are you intimidated by Git? Can’t figure out merge vs rebase? Are you afraid of screwing up something any time you have to do something in Git? Do you rely on ChatGPT or random people’s answer on StackOverflow to fix your problems? Your coworkers are tired of explaining Git to you all the time? Git is something we all need to use, but few of us really master it. I created this course to improve your Git (and GitHub) knowledge at a radical level. A course that helps you feel less frustrated with Git. Launching May 21, 2024. Join the waiting list!
→ Get my JavaScript Beginner's Handbook
→ Read my JavaScript Tutorials on The Valley of Code
→ Read my TypeScript Tutorial on The Valley of Code

Here is how can I help you: