[r6rs-discuss] [Formal] Map returning twice

From: AndrevanTonder <andre>
Date: Mon Mar 19 11:49:44 2007

On Thu, 15 Mar 2007, Abdulaziz Ghuloum wrote:

> If your comment is not going as far as this, maybe it should just say "map
> should not destructively update the list it returns" instead.

I believe you are correct. In fact, I suspect the problem can occur if
intermediate results and local variables are mutated even if they do not form
part of the returned result.

As a result, the issue of the formal comment may apply not only to procedures
like map that return new structure, but to other (all?) higher-order
procedures, including those that do not return a new object.

Andre
Received on Mon Mar 19 2007 - 11:49:05 UTC