On Thu, Mar 1, 2018 at 4:28 PM <[email protected]> wrote:

> is the statement right?

It depends on the POV. I see copy as more fundamental than append. It's
easy to write append using copy, not exactly trivial the other way around.
Consider cases like copy(a[], a[1:]) or copy(a[1:], a).


-- 

-j

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