Pretty sure it's just a typo / bug. I think it should read:
{servlet ::servlet
type ::type
:or {type :jetty}
:as service-map}
On Tue, Mar 19, 2013 at 10:09 PM, Matching Socks <[email protected]> wrote:
> I'm puzzled by two :or syntaxes that are used in io.pedestal.service.http,
> from [io.pedestal/pedestal.service "0.1.1-SNAPSHOT"], which is where
> following along with the Getting Started got me.
>
> In one place, it pairs :or with a map whose keys are symbols being bound in
> the outer form:
>
> {routes ::routes
> file-path ::file-path
> resource-path ::resource-path
> method-param-name ::method-param-name
> :or {file-path nil
> resource-path "public"
> method-param-name :_method}
> :as service-map}
>
> A little farther down, it pairs :or with a map whose key is a key from the
> map being destructured:
>
> {servlet ::servlet
> type ::type
> :or {::type :jetty}
> :as service-map}
>
> In a tiny experiment, I don't see the second way working. But the compiler
> does not emit any message. Is there something subtle going on?
>
> helloworld.server=> (defn a [{x :X y :Y :or {y 3}}] (vector x y))
> #'helloworld.server/a
> helloworld.server=> (a {:X 7})
> [7 3]
> helloworld.server=> (defn a' [{x :X y :Y :or {:Y 3}}] (vector x y))
> #'helloworld.server/a'
> helloworld.server=> (a' {:X 7})
> [7 nil]
>
>
>
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