Tassilo and Alan,
Thanks for responding. We're new to clj and don't have a good feel of
when to you use macros over functions.
(defmacro with-dflt
"Runs body in a try/catch returning result of body
if no exception otherwise default"
[default & body]
`(try
(do ~@body)
(catch Exception _# ~default)))
Here's how it could be used with map, but it needs to be wrapped in an
anonymous function and I think that was part of your point.
(map #(err/with-dflt 42.0 (Double. %)) ["0" "1.5" "3.8e-1" "broken"
"0x1.bP2" "Infinity" "NaN"])
(0.0 1.5 0.38 42.0 6.75 Infinity NaN)
We are using it in map like this,
(map #(err/with-dflt 0.0 (-> % r Double.))
["Holding" "OA Dur" "OA Cvx" "KRDur 6M" "KRDur 1Y" "KRDur 2Y"
"KRDur 5Y" "KRDur 10Y" "Mtge Sprd Dur"
"OA Sprd Dur" "Price" "PV" "OA DP/DY" "KR DP/DY 6M" "KR DP/DY 1Y"
"KR DP/DY 2Y" "KR DP/DY 5Y" "KR DP/DY 10Y"])
We also wanted to put a default around any form,
(err/with-dflt 0.0 (some #(when (= (% "Bench Code") "Bench TSY 10Y") (-
> "OA DP/DY" % Double.))
(-
>> ctx :run-file-deps :bench :file csv/load-csv))
One style question we have is whether it's worth creating small,
specific parse with default functions for doubles and ints or simply
to use something like the following inline
(err/with-dflt 0.0 (Double. num-str))
If it's worth creating separate parse functions, we were wondering if
anybody had packaged up a set already.
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