Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

JavaScript React Components (2018) Stateful Components and Lifecycle Methods Prevent Memory Leaks with componentWillUnmount()

Am I understanding this correctly?

From what I'm understanding the componentWillUnmount method will only clear the timer from memory when the component is removed from the DOM? So if the timer stays in the page, the memory will still be used? Will the component unmount when the user navigates to a different page where the timer is not showing but still in the previous page? Just trying to wrap my head fully around this.