Maps are functions of their keys because that's what maps are.
Keywords are functions of their maps because it is useful.
(def foo [{:name "Bob", :age 20}, {:name "Sue", :age 19}])
(sort-by :age foo)
(sort-by :name foo)
Note that sort-by doesn't specifically take a keyword or know what
maps are.
It just runs (keyfn x) on each thing to produce something it can
hopefully sort on. Since keywords are functions on maps, this works
out well.
On Dec 11, 3:29 pm, "Aaron Cohen" <[email protected]> wrote:
> Isn't it just asking for confusion?
>
> I really like that maps are functions of their keys though.
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