Why Do We Get "undefined is not a function" in JavaScript?

Why Do We Get "undefined is not a function" in JavaScript?

Ferenc Almasi β€’ Last updated 2021 January 15 β€’ Read time 1 min read
  • twitter
  • facebook
JavaScript

The error speaks for itself. You want to execute a function. However, what you are trying to execute is evaluated to as undefined. This will throw the following error as it’s basically the same as saying undefined(); And since undefined is a reserved keyword, it cannot be called as a function.

Typeerror logged to console
undefined
If you would like to see more Webtips, follow @flowforfrank

50 JavaScript Interview Questions

Resources:

  • twitter
  • facebook
JavaScript
Did you find this page helpful?
πŸ“š More Webtips
Frontend Course Dashboard
Master the Art of Frontend
  • check Access 100+ interactive lessons
  • check Unlimited access to hundreds of tutorials
  • check Prepare for technical interviews
Become a Pro

Courses

Recommended

This site uses cookies We use cookies to understand visitors and create a better experience for you. By clicking on "Accept", you accept its use. To find out more, please see our privacy policy.