On Sat, Nov 19, 2011 at 7:28 PM, Randy Pensinger <[email protected]> wrote:
> user=> (def stringComparator
> (comparator (fn [a b]
> (do
> (println (str "comparing '" a "' to '" b "'"))
> (.compareTo a b)))))
> #'user/stringComparator
The docs indicate comparator takes a predicate, i.e., a function that
returns truthy or falsey.
I changed your definition to this:
(def stringComparator
(comparator (fn [a b]
(do
(println (str "comparing '" a "' to '" b "'"))
(neg? (.compareTo a b))))))
And that worked as expected:
user> (.compare stringComparator "b" "a")
comparing 'b' to 'a'
comparing 'a' to 'b'
1
user> (.compare stringComparator "a" "a")
comparing 'a' to 'a'
comparing 'a' to 'a'
0
user> (.compare stringComparator "a" "b")
comparing 'a' to 'b'
-1
--
Sean A Corfield -- (904) 302-SEAN
An Architect's View -- http://corfield.org/
World Singles, LLC. -- http://worldsingles.com/
"Perfection is the enemy of the good."
-- Gustave Flaubert, French realist novelist (1821-1880)
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