As a relative Clojure novice I'm finding Lisp's s-expressions provide a
simplified debugging experience, Java stacktraces aside, unparallelled
in any other language I've come across. I was recently having trouble
with this function:
(defn shared-aspects [my-id your-id]
(for [[{left :l right :r id1 :id asp1 :aspect} {asp2 :aspect}]
(partition 2 (sql-aspects-by-id {:mi my-id :yi your-id}))
:let [asp1 (keyword asp1)
asp2 (keyword asp2)
rg (if (= id1 my-id) (str (asp->colour asp1)
(asp->colour asp2))
(str (asp->colour asp2)
(asp->colour asp1)))]]
{:rg rg :asp-id ((first (sql-joint-aspect-id {:le left :ri right
:ty "shared"})) :id)}))
The magic of s-expressions allowed me to extract what I suspected was
the culprit:
(partition 2 (sql-aspects-by-id {:mi my-id :yi your-id}))
... and test it separately in the REPL. I was able to first test the
function's output, assess it's suitability for the end result I required
then, when found unsatisfactory, substitute various alternatives to
partition and slot the modified version back into the main function
defintion. This option of wrapping and substituting is what makes Lisp
so special within a live REPL.
Other functional languages, such as Scala and Haskell, claim to enjoy a
similar level of composability but I can't imagine anything without
s-expressions offering quite the same experience.
gvim
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