About code style, don't do "def"s inside of a function - this binds them
inside the entire namespace, so your values are escaping and persisting
when you just want locals. Use "let":
(defn averaged [x]
(let [summed (reduce + x)
counted (count x)]
(/ summed counted)))
That function actually does work, by the way. I suspect that farther up
in your lighttable/repl session you bound "avged" to a number, like (def
avged 10).
Stephen Feyrer <mailto:stephen.fey...@gmail.com>
July 9, 2014 at 6:48 PM
Hi,
I tried to create the function below in a Lighttable instarepl. In
lieu of any better idea for formatting, the < > statements below
indicate instarepl output.
(defn avged ([x]
((def sumed (reduce + x)) < 10 >
(def counted (count x)) < 4 >
(def result (/ sumed counted)) < 5/2 >
result
)))
(avged [1 2 3 4]) < java.lang.ClassCastException: java.lang.Long
cannot be cast to clojure.lang.IFn
Var.java:392 clojure.lang.Var.fn
Var.java:423 clojure.lang.Var.invoke
(Unknown Source) user/avged >
The objective of this function is just a learning exercise.
I have three questions:
1. Why doesn't it work, return a value?
2. What does the error message mean? and seeing this or similar
again, how do I investigate to get a meaningful Clojure solution?
3. Code Style, what can I do to improve readability and form?
Thanks.
--
Stephen Feyrer.
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