Array include any value from another array?

Question

What\'s the most efficient way to test if an array contains any element from a second array?

Two examples below, attempting to answer the question does foods

Answer 1

You can check if the intersection is empty.

cheeses = %w(chedder stilton brie mozzarella feta haloumi)
foods = %w(pizza feta foods bread biscuits yoghurt bacon)
foods & cheeses
=> ["feta"] 
(foods & cheeses).empty?
=> false