Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript JavaScript Unit Testing Introducing Unit Testing Greater Expectations

Dev D
seal-mask
.a{fill-rule:evenodd;}techdegree
Dev D
Front End Web Development Techdegree Student 406 Points
Posted by Dev D
.a{fill-rule:evenodd;}techdegree
Dev D
Front End Web Development Techdegree Student 406 Points

Why use Map function and not for each?

Why use Map function and not for each?

1 Answer

Steven Parker
Steven Parker
231,269 Points
Steven Parker
Steven Parker
231,269 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.