In edn, a keyword is an identifier that designates itself, while a symbol
is a keyword that designates something else.
This means keys in a map should generally be keywords, unless they identify
something beyond themselves. For example:
{:profiling/function-count {clojure.core/vec 10}}
On Thu, 24 Oct 2019 at 05:32, Anton Vodonosov <avodono...@gmail.com> wrote:
> I'm working on a config file format in EDN, and in doubt: should I use
> keywords or symbols as map keys.
>
> After all, the colon is an extra keyboard press - an extra effort for
> users.
>
> As EDN parser doesn't evaluate expressions, there is no need to quote
> symbols when using them as EDN map keys (unlike clojure map literals)
>
> I mean,
>
> (edn/read-string "{a 1 b 2}")
>
> works, while using a clojure map literal would require quoting A and B:
>
> {'a 1 'b 2}
>
> So, is it a good idea to use symbols instead of keywords as map keys in a
> config file?
>
> Probably, an advantage of keywords that they look different visually, so a
> reader easily distinguishes keys from values; But proper indentation,
> optional commas between the key-value pairs in map may be enough for a
> reader to understand everything immediately.
>
>
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--
James Reeves
booleanknot.com
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