Hi,
I'm new to clojure and came from a Lisp background. While learning I
clojure I came accross the two different ways of creating anonymous
functions ((fn ...) and #(...)). I tried to construct the accumulator
function in clojure using these forms and this is what I wrote (this
might seem naive but I'm just a beginner :)
1.
(defn foo [n]
(let [r (ref n)]
(fn [i]
(dosync
(alter r + i) @r))))
And it works fine:
user> (def f (foo 10))
#'user/f
user> (f 1)
11
user> (f 1)
12
2.
(defn foo2 [n]
(let [r (ref n)]
#((dosync
(alter r + %) @r))))
This does not work:
user> (def f (foo2 10))
#'user/f
user> (f 1)
; Evaluation aborted.
java.lang.ClassCastException: java.lang.Integer cannot be cast to
clojure.lang.IFn (NO_SOURCE_FILE:0)
[Thrown class clojure.lang.Compiler$CompilerException]
However, another different function defined below just works:
user> (defn bar [n]
#(+ n %))
#'user/bar
user> (def b (bar 10))
#'user/b
user> (b 1)
11
Obviously I might be missing something... Please help.
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