[Haskell-cafe] Ordered JSON objects?

Wojtek Narczyński wojtek at power.com.pl
Mon Dec 15 22:01:12 UTC 2014

On 15.12.2014 20:32, Tobias Dammers wrote:

> Anyway, one thing I'm running up against is that I am going to need
> ordered key/value collections, which I believe is something JSON does
> not support out-of-the-box: "objects" ({"foo":15, "bar":23}) are
> conceptually unordered key/value collections (and Aeson treats them as
> such, using hash maps as the intermediate storage format), so I lose
> ordering;

JSON does not forbid ordering of maps by key, I believe. But you'd need 
to create an OrderedMap and patch aeson. It would be very useful, the 
mixing of key order is nuisance for human JSON consumers.

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