Hi,
I have a 'find' dyadic verb that takes a (array of) integer(s), walks
the associative array recursively and yields the current element when
not found in the associative array, as below:
var =: (4&=+.1&=)@(3!:0)
find =:([`((]$:~]{::~2;<@[i.~1&{::@]) :: [)@.(var@[))"(0 _)
Examples:
(1 2) find (0;(2;1);<(5.22;3.5))
(2 1) find (0;(2;1);<('';3.5))
Now, the 1st example works as expected, but when unifying with the empty
list as in the 2nd example I get zeroes that (apparently??) are fill
atoms. I'd like my result to respect J syntax (for syntactic
unification) and therefore where the second example yields '0 3.5' I
would like to get a syntax error.
Is this possible? One way I thought of would be to build the result as a
string and execute it, but that would be dog-slow on larger data,
wouldn't it?
Thanks for your consideration,
Raoul
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