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JavaScript JavaScript Unit Testing Introducing Unit Testing Greater Expectations

Dev D
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Dev D
Front End Web Development Techdegree Student 406 Points
Posted by Dev D
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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
231,261 Points
Steven Parker
Steven Parker
231,261 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.