Proposal: Non-allocating way to iterate over a Data.Map: traverseWithKey_

[Edward Kmett]

On Tue, Jul 2, 2013 at 2:45 PM, Henning Thielemann <
lemming at henning-thielemann.de> wrote:

>   Foldable.sequence_ . Map.mapWithKey f



which looks more elegant.
>

This has the unfortunate consequence that it builds an entire new map
strictly before sequencing it, due to the fact that Data.Map is
spine-strict. =(

-Edward
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