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Comment by throwaway09432 | Hacker News Reader

Can you map over this and preserve the NonEmptyArray type?

Do you mean pass in a type?

    type NonEmptyArray<T> = [T, ...T[]];

I mean if I have a NonEmptyArray say xs, and I then xs.map(x=>2*x), will the result of this expression be a NonEmptyArray ?

No, unfortunately it will just be number[] as the return type.