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 JavaScript Unit Testing Introducing Unit Testing Greater Expectations

1 Answer

Steven Parker
Steven Parker
216,148 Points

The "map" method will run a function on each element, collecting the returned values into a new array, and when it finishes it returns that new array.

On the other hand, a "forEach" will run a function on each element, but it ignores any returned value from the function and it doesn't return anything itself.

So you would use "map" instead of "forEach" when you want to get an array of returned values back.