a) If your map represents an "record" with "fields" (for instance if
it would make sense to also represent it as record via defrecord),
then use (:field map)

b) If your map is a collection of key/vals, then use (map key)

Rationale for a): it will allow better migration path if you use
defrecords at some point, and conveys the semantic that you know there
should be the given key in the map

Rationale for b): you have an existing map, but the key may or may not
be present. Note that you can also use the version which returns
default value if there's no key in the map: (map key default-value)

Rich already mentioned all this, better, in an earlier email which I'm
too lazy to search for right now.

-- Laurent


2013/1/29 Jonathon McKitrick <jmckitr...@gmail.com>:
> Either one works, is there any kind of guideline on which to prefer, when?
> Or is it entirely personal preference?  It seems each way could be more
> readable in different circumstances....
>
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