I'm just wondering—is there a way to match methods' dispatch-values
using a function other than isa?—such as with a macro. This is what
I'm thinking of:
(defmulti foo identity #(re-find %2 %1)) ; uses the last function
instead of isa? to match
(defmethod foo #"xyzzy" [x]
x))
(defmethod foo #"plugh" [x]
(str x "!"))
(defmulti bar identity #(%1 %2)) ; uses the last function to match
(defmethod #(apply distinct? %) [x]
x))
(defmethod (fn [x] (some #(> % 3) x)) [x]
(conj x 1 3))
(foo "arstninixyzzy") ; matches the first method, returns
"arstninixyzzy"
(foo "arstplughars") ; matches the second method, returns
"arstplughars!"
(foo "arststr") ; does not match anything, raises error
(bar [3 2 5]) ; matches the first method, returns [3 2 5]
(bar [2 3 5 3]) ; matches the second method, returns [2 3 5 3 1 3]
(bar [1 2 0 2]) ; matches nothing, raises error
This may not an important enough feature to support in the core; I'm
just thinking it may come useful in the future, and so am wondering if
it's possible with a macro.
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