There's no interfaces, that's the function definition.
define function max
(defn max
attach docstring
"Returns the greatest of the nums."
attach metadata
{:added "1.0"}
if max is called with one argument, use this function definition
([x] x)
if max is called with two arguments, use this function definition
([x y] (if (> x y) x y))
if max is called with more than two arguments, use this function definition
([x y & more]
(reduce max (max x y) more)))
___________
As you can see, y is introduced in one of the functions definitions.
Also see:
http://clojure.org/special_forms#Special%20Forms--(fn%20name?%20[params*%20]%20exprs*)<http://clojure.org/special_forms#Special%20Forms--%28fn%20name?%20[params*%20]%20exprs*%29>
and
http://clojure.org/metadata
Jonathan
On Sun, Jul 10, 2011 at 11:44 PM, octopusgrabbus
<[email protected]>wrote:
> For Question 1 this is an example of multiple interfaces. Got it.
>
> On Jul 10, 5:42 pm, octopusgrabbus <[email protected]> wrote:
> > From Clojure api for max
> >
> > (defn max
> > "Returns the greatest of the nums."
> > {:added "1.0"}
> > ([x] x)
> > ([x y] (if (> x y) x y))
> > ([x y & more]
> > (reduce max (max x y) more)))
> >
> > Question 1: Why can y be introduced as a local binding without a let?
> >
> > Question 2: What is the map {:added "1.0"} doing?
> >
> > Thanks.
> > cmn
>
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