funny you should mention that!!! that is exactly what I meant by 'my
fault'...I've come to realise that dynamic scope is almost evil, thus I
go to great lengths to avoid it completely...in the rare cases where I
do use it I always make sure it is bound to a init/default value :)
Jim
On 29/04/13 17:17, AtKaaZ wrote:
I'm thinking something like (def ^:dynamic *a*) where it would make
more sense that it's unbound at first
On Mon, Apr 29, 2013 at 7:00 PM, Jim - FooBar(); <jimpil1...@gmail.com
<mailto:jimpil1...@gmail.com>> wrote:
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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