forEach or map ?

Comments

[Jordi]

Very easy, if you need to return an array, use map. Otherwise forEach.

[John Peters]

Both iterate over the collection, one returns values the other doesn't. There's no difference in the iteration part.

People like to make rules on when to use them but I use map, and reduce way more than any other method regardless of mutability. Mutability is a choice of what we do with the data, not the function's themselves. We can choose to mutate or not using just map.

[Patrik Jajcay]

Map for immutable new array, forEach for mutations / side effects.

[Jamie Barton]

Like others have said, they both do very different things. If you don't need to return an array, use forEach :)

[Ralph Virtucio]

Thank you so much for your opinions !

[Florian]

Depends on the usecase. I like map.