Making a huge array of values to in-place edit by copy is just... drinking water with the glass upside down. Why would you do that? Either do a nice imperative

Making a huge array of values to in-place edit by copy is just... drinking water with the glass upside down. Why would you do that? Either do a nice imperative for-loop as that is an excellent and imperative way of solving the problem (which I don't know what it is.) Or solve it in any of the normal functional ways. Pick the style that you and your team likes.