Clojure documentation only talks about
:or followed by a map (from http://clojure.org/special_forms ):
> Also optionally, an *:or* key in the binding form followed by another
> map may be used to supply default values for some or all of the keys if
> they are not found in the init-expr:
>
> (let [{a :a, b :b, c :c, :as m :or {a 2 b 3}} {:a 5 :c 6}]
> [a b c m])
> ->[5 3 6 {:c 6, :a 5}]
>
>
On Friday, April 12, 2013 6:00:27 PM UTC-4, henry clifford wrote:
>
> I'm trying to use the :or destructuring syntax as seen here applied to a
> map
>
> (def point {:y 7})
> (let [{:keys [x y] :or {x 0 y 0}} point]
> (println "x:" x "y:" y))
> x: 0 y: 7
>
> but I can't get this to work with vectors:
>
> (def point [7])
> (let [[x y :or [0 0]] point]
> (println "x:" x "y:" y))
>
> what' I'm expecting is x:7 y:0
>
> but I'm getting Exception Unsupported binding form: :or
>
> Any thoughts on this?
> Thanks!
>
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