Please open a ticket for this in JIRA, thanks -
http://dev.clojure.org/jira/browse/CLJS
David
On Sun, Nov 20, 2011 at 12:33 PM, Jeff Valk <jv-li...@tx.rr.com> wrote:
> Hello all,
> I ran into an extend-type issue with the ClojureScript compiler output. If
> there's a better place to report such things, please point me there.
>
> If I define a protocol method with multiple arities, implementing it using
> deftype works as expected, however extend-type does not. The former
> compiles to a single javascript function, which checks argument length to
> handle arity. The latter produces two identically named functions, the
> second of which overwrites the first; hence only one arity is available at
> runtime.
>
> Here's a simplified example. Given a protocol:
>
> (defprotocol MyProtocol
> (something [this]
> [this x]))
>
> I would expect the following two code snippets to compile with functional
> equivalence.
>
> (deftype MyType []
> MyProtocol
> (something [this] ... )
> (something [this x] ... ))
>
> (deftype MyType [])
> (extend-type MyType
> MyProtocol
> (something [this] ... )
> (something [this x] ... ))
>
> The former compiles 'something' to a single function. The latter compiles
> as:
>
> myns.MyType.prototype.myns$MyProtocol$ = true;
> myns.MyType.prototype.myns$MyProtocol$something = function(this$) { ...
> };
> myns.MyType.prototype.myns$MyProtocol$something = function(this$, x) {
> ... };
>
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