> user=> (defn if-a [a b] (if (a) (str a) (str b)))
The problem is " (a) " - it tries to call a as a function, which
throws NullPointer if a is nil. You meant:
> user=> (defn if-a [a b] (if a (str a) (str b)))
mg
On Tue, Aug 23, 2011 at 9:37 PM, Andrew Xue wrote:
> this doesn't work:
>
>
You have an extra set of parens around a, treating it as a function call. Try:
(defn if-a [a b] (if a (str a) (str b)))
Hope that helps,
Dave
On Tue, Aug 23, 2011 at 4:37 PM, Andrew Xue wrote:
> this doesn't work:
>
> user=> (defn if-a [a b] (if (a) (str a) (str b)))
> #'user/if-a
> user=> (
