Hi all,
I would like to throw an exception when I'm trying to retrieve a value in a map
for a key that doesn't exist.
The obvious first shot was:
(get {:foo "bar"} :foo (throw (new Exception "Oh no!")))
However, this doesn't work because the exception always throws since get
apparently eagerly evaluates it's arguments.
One way to work around this could be:
(defn get-with-exception [map key]
(let [res (get map key (new Exception "my-exception"))]
(if (= (class res) java.lang.Exception)
(throw res)
res)))
I was wondering, is there another more concise/idiomatic way?
Cheers
Andreas
--
"Test-driven Dentistry (TDD!) - Not everything should be test driven"
- Michael Fogus
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**********************************************************
Andreas Koestler, Software Engineer
Leica Geosystems Pty Ltd
270 Gladstone Road, Dutton Park QLD 4102
Main: +61 7 3891 9772 Direct: +61 7 3117 8808
Fax: +61 7 3891 9336
Email: andreas.koest...@leica-geosystems.com
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