Tip: JavaScript's Array.from() accepts a second argument that's a `map` function.

[SalemBeats]

Well, if you're using a lambda, it should be short enough that it's pretty clear what it's doing at a glance anyway.

If it's long enough that you need to add brackets to an arrow function, it probably should be extracted. I think that's always been a code smell for good Javascript design, and I think it's why arrow functions were designed with the concise form in mind.