Hi all,
If you have a protocol
(defprotocol Foo (foo [x] [x y]))
and implement it for the record
(defrecord Bar [p q r]
Foo
(foo [x] x)
(foo [x y] [x y]))
you write each method separately. The same is true for extend-type. Yet, if
you use extend-protocol syntax is more like usual Clojure multi-arity
function definition:
(extend-protocol Foo
Bar
(foo
([x] x)
([x y] [x y])))
The first question is why there is a difference?
Secondly, if you mess up which syntax is where, the error you will get is
quite obscure, nothing guards you against essentially a *wrong syntax*:
both extend-type and extend-protocol are macros, so it shouldn’t be too
difficult to add a quick check on correctness.
But lastly, wouldn’t it be better to have a uniform syntax?
Regards,
Alexey
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