2011/4/21 Tzach <tzach.livya...@gmail.com>:
> I made a stupid mistake, and I want to share. This is not the actual code, I
> simplify it to demonstrate the point.
>
> I use a atom to a global hash as follow:
>
> (def *aa* (atom {:x 3 :y 4 :z 17}))
>
> Somewhere on the code, I have a function which look at the state and do
> something:
>
> (defn foo [state]
>
> (when (:x state) print "yes"))
>
>
>
> My mistake - call foo as:
>
> (foo *aa*)
>
> where I should have call it
>
> (foo @*aa*)
>
>
>
> Since (:x (atom *aa*)) is nil, print was not execute.
>
> 4 long hours later, I got it, fix it, and added the appropriate
> precondition.
>
> I understand there is no escape from my own silliness, but could I have
> avoided this mistake to begin with?
>
> Any best practice I broke?
The compiler could have pointed out the error if you had given a type
to the argument such as ^Map.
(That is my main use for types: to prevent shooting myself on the foot
like you did.)
Albert
--
http://albert.rierol.net
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