in reply to Difference between two arrays - is there a better way?

is there another clever way

Another way for sure. Whether it is "clever"? 

@list1 = (1, 2, 3, 4, 5);
@list2 = (2, 3, 4);;
@diff{ @list2 }= ();;

print grep !exists($diff{$_}), @list1;;
1 5

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