I 've found that whenever I get a var-unbound exception it is almost
always my fault and my fault only...why would you do (def a) anyway?
Jim
On 29/04/13 16:32, AtKaaZ wrote:
How do you guys handle the cases when the var is unbound? I mean
specifically in the cases where you just test if the var is nil.
=> (def a)
#'clojurewerkz.titanium.graph-test/a
=> a
#<Unbound Unbound: #'clojurewerkz.titanium.graph-test/a>
=> (nil? a)
false
=> (bound? a)
ClassCastException clojure.lang.Var$Unbound cannot be cast to
clojure.lang.Var clojure.core/bound?/fn--4837 (core.clj:4954)
=> (bound? #'a)
false
ok imagine the following sample :))
=> (defn decorate [input]
(when (not (nil? input)) (str "prefix:" input ":suffix")))
#'clojurewerkz.titanium.graph-test/decorate
=> (decorate "1")
"prefix:1:suffix"
=> (decorate a)
"prefix:Unbound: #'clojurewerkz.titanium.graph-test/a:suffix"
so... fix?
but more importantly does anyone need to add checks for
is-the-var-bound in their code where they checked for nil ?
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