Can anyone enlighten me as to why this bit of code spits back that the X is unsafe in 'try', well I know why, but more so how to fix it.
try X = lists:append(lists:zipwith3(fun(X, Y, Z) -> [X, Y, Z] end, Data1, Data2, Data3)) of
MP -> X
catch K -> (X = 0)
end.
%MP开发者_JAVA技巧 = [lists:zipwith3(X, Y, Z) || X, Y, Z <- [Data1, Data2, Data3]],
P = X
The simplest way to fix it is to put the assignment outside of the try-catch:
X =
try lists:append(lists:zipwith3(fun(X, Y, Z) -> [X, Y, Z] end, Data1, Data2, Data3)) of
MP -> MP
catch K -> 0
end.
It is unsafe I believe due to the fact that you do not cover all the exceptions. When you have
catch K -> (X = 0)
I believe it'll only catch thrown exceptions, there are still errors, and exits. IIRC so you will probably need
catch _:K -> (X=0)
or explicitly catch them as
catch
error:K -> (X=0);
exit:K -> (X=0);
throw:K -> (X=0)
(I'm not 100% that I have the atom names correct, but the idea is still the same)
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