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 KASH3 Reference Manual
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Function

PositionProperty ( func pred ) -> func pos

Optional Arguments

FailanyDetermines what to return in case of failure.

Description

Construct a functional `pos(<list> l) -> elt-ord^rat' which returns the position of the first element of `l' which suffices the predicate function `pred'.
Return FAILURE if no such element exists in `l'.
Note: Apparently `pred' must have `-> elt-alg^boo' out-signature.

Examples

l:=[Random(1000)..1000+Random(1000)];; f:=PositionProperty(i->i mod 17=0);; l; f(l);
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